{ "site": "EstimaHome", "url": "https://estimahome.com/", "version": "2.0.0", "lastUpdated": "2026-10-20", "publisher": { "name": "EstimaHome", "url": "https://estimahome.com/", "email": "hello@estimahome.com" }, "citation": "“.” EstimaHome, .", "notes": "ceil() rounds up to purchasable units. Price inputs default to /api/prices.json, which holds ballpark U.S. home-center prices, not quotes. Any input can be set with a URL query parameter on the calculator page, for example /deck-calculator/?lengthFt=20&widthFt=12.", "pricesUrl": "https://estimahome.com/api/prices.json", "guidesUrl": "https://estimahome.com/api/guides.json", "categories": [ { "id": "outdoor", "name": "Decks, fences & hardscape", "calculators": [ "deck", "fence", "concrete", "pavers", "retaining-wall" ] }, { "id": "landscape", "name": "Landscaping", "calculators": [ "mulch", "gravel", "topsoil" ] }, { "id": "interior", "name": "Walls & ceilings", "calculators": [ "drywall", "paint", "wallpaper", "insulation" ] }, { "id": "floors", "name": "Floors", "calculators": [ "flooring", "tile" ] }, { "id": "roofing", "name": "Roofing", "calculators": [ "roofing" ] } ], "calculators": [ { "id": "deck", "name": "Deck Materials Calculator", "url": "https://estimahome.com/deck-calculator/", "category": "outdoor", "description": "Deck boards, joists, screws, posts and footing concrete for a rectangular deck.", "related": [ "https://estimahome.com/concrete-calculator/", "https://estimahome.com/fence-calculator/", "https://estimahome.com/paver-calculator/" ], "guides": [ "https://estimahome.com/guides/deck-cost-12x16/" ], "inputs": [ { "name": "lengthFt", "label": "Deck length (parallel to house)", "unit": "ft", "type": "number", "group": "size", "default": 16, "min": 1, "max": 200, "help": "Decking runs this direction." }, { "name": "widthFt", "label": "Deck depth (out from house)", "unit": "ft", "type": "number", "group": "size", "default": 12, "min": 1, "max": 100, "help": "Joists span this direction." }, { "name": "boardWidthIn", "label": "Board width, actual", "unit": "in", "type": "number", "group": "options", "default": 5.5, "min": 1, "max": 12, "help": "A 5/4×6 or 2×6 is 5.5 in wide." }, { "name": "gapIn", "label": "Gap between boards", "unit": "in", "type": "number", "group": "options", "default": 0.125, "min": 0, "max": 1 }, { "name": "boardLengthFt", "label": "Board length", "unit": "ft", "type": "select", "group": "options", "default": "16", "options": [ "8", "10", "12", "16", "20" ] }, { "name": "joistSpacingIn", "label": "Joist spacing, on center", "unit": "in", "type": "select", "group": "options", "default": "16", "options": [ "12", "16", "24" ] }, { "name": "wastePct", "label": "Decking waste", "unit": "%", "type": "number", "group": "options", "default": 10, "min": 0, "max": 50 }, { "name": "beamRows", "label": "Rows of footings", "unit": "rows", "type": "number", "group": "options", "default": 1, "min": 1, "max": 10, "help": "Usually 1 with a ledger on the house, 2 for a freestanding deck." }, { "name": "postSpacingFt", "label": "Max post spacing along beam", "unit": "ft", "type": "number", "group": "options", "default": 8, "min": 2, "max": 16 }, { "name": "footingDiaIn", "label": "Footing diameter", "unit": "in", "type": "number", "group": "options", "default": 12, "min": 4, "max": 36 }, { "name": "footingDepthIn", "label": "Footing depth", "unit": "in", "type": "number", "group": "options", "default": 36, "min": 6, "max": 96, "help": "Go below your local frost line." }, { "name": "bagYieldCuFt", "label": "Yield per 80 lb bag", "unit": "cu ft", "type": "number", "group": "options", "default": 0.6, "min": 0.1, "max": 2 }, { "name": "screwsPerBox", "label": "Screws per box", "unit": "ea", "type": "number", "group": "options", "default": 350, "min": 1, "max": 5000 }, { "name": "priceBoard", "label": "Deck board", "unit": "$/ea", "type": "number", "group": "prices", "default": 18, "min": 0, "priceKey": "deck_board" }, { "name": "priceJoist", "label": "Joist", "unit": "$/ea", "type": "number", "group": "prices", "default": 22, "min": 0, "priceKey": "deck_joist" }, { "name": "priceScrewBox", "label": "Box of deck screws", "unit": "$/box", "type": "number", "group": "prices", "default": 38, "min": 0, "priceKey": "deck_screw_box" }, { "name": "pricePost", "label": "Post", "unit": "$/ea", "type": "number", "group": "prices", "default": 25, "min": 0, "priceKey": "deck_post" }, { "name": "priceBag", "label": "80 lb concrete", "unit": "$/bag", "type": "number", "group": "prices", "default": 6.5, "min": 0, "priceKey": "concrete_bag_80" }, { "name": "spreadPct", "label": "Estimate range (±)", "unit": "%", "type": "number", "group": "prices", "default": 15, "min": 0, "max": 100 } ], "formulas": [ { "output": "boardRows", "text": "Board rows = ⌈ depth × 12 ÷ (board width + gap) ⌉", "expr": "ceil(widthFt*12/(boardWidthIn+gapIn))" }, { "output": "deckingLinearFt", "text": "Decking linear feet = board rows × deck length", "expr": "boardRows*lengthFt" }, { "output": "boards", "text": "Boards = ⌈ linear feet × (1 + waste ÷ 100) ÷ board length ⌉", "expr": "ceil(deckingLinearFt*(1+wastePct/100)/boardLengthFt)" }, { "output": "joists", "text": "Joists = ⌊ length × 12 ÷ joist spacing ⌋ + 1", "expr": "floor(lengthFt*12/joistSpacingIn)+1" }, { "output": "screws", "text": "Screws = board rows × joists × 2", "expr": "boardRows*joists*2" }, { "output": "screwBoxes", "text": "Screw boxes = ⌈ screws ÷ screws per box ⌉", "expr": "ceil(screws/screwsPerBox)" }, { "output": "footings", "text": "Footings = footing rows × (⌈ length ÷ post spacing ⌉ + 1)", "expr": "beamRows*(ceil(lengthFt/postSpacingFt)+1)" }, { "output": "concreteCuFt", "text": "Footing concrete (cu ft) = footings × π × (diameter ÷ 24)² × (depth ÷ 12)", "expr": "footings*PI*(footingDiaIn/24)^2*(footingDepthIn/12)" }, { "output": "bags", "text": "Bags = ⌈ concrete ÷ bag yield ⌉", "expr": "ceil(concreteCuFt/bagYieldCuFt)" }, { "output": "cost", "text": "Cost = Σ (quantity × unit price); range = cost × (1 ± range % ÷ 100)", "expr": "sum(qty*unitPrice)*(1±spreadPct/100)" } ], "defaultResult": { "values": { "areaSqFt": 192, "boardRows": 26, "deckingLinearFt": 416, "boards": 29, "joists": 13, "screws": 676, "screwBoxes": 2, "footings": 3, "concreteCuFt": 7.07, "bags": 12 }, "groups": [ { "title": "Materials", "subtotal": 1037, "low": 881.45, "high": 1192.55, "items": [ { "key": "deck_board", "label": "Deck boards, 16 ft", "qty": 29, "unit": "ea", "unitPrice": 18, "cost": 522 }, { "key": "deck_joist", "label": "Joists, 12 ft span", "qty": 13, "unit": "ea", "unitPrice": 22, "cost": 286 }, { "key": "deck_screw_box", "label": "Deck screws (676 pcs)", "qty": 2, "unit": "box", "unitPrice": 38, "cost": 76 }, { "key": "deck_post", "label": "Posts", "qty": 3, "unit": "ea", "unitPrice": 25, "cost": 75 }, { "key": "concrete_bag_80", "label": "Concrete, 80 lb bags", "qty": 12, "unit": "bag", "unitPrice": 6.5, "cost": 78 } ] } ] } }, { "id": "fence", "name": "Fence Materials Calculator", "url": "https://estimahome.com/fence-calculator/", "category": "outdoor", "description": "Posts, rails, pickets and post-hole concrete for a straight wood fence.", "related": [ "https://estimahome.com/concrete-calculator/", "https://estimahome.com/deck-calculator/", "https://estimahome.com/retaining-wall-calculator/" ], "guides": [ "https://estimahome.com/guides/privacy-fence-cost-100-ft/" ], "inputs": [ { "name": "lengthFt", "label": "Fence length", "unit": "ft", "type": "number", "group": "size", "default": 100, "min": 1, "max": 5000 }, { "name": "heightFt", "label": "Fence height", "unit": "ft", "type": "number", "group": "size", "default": 6, "min": 2, "max": 10 }, { "name": "postSpacingFt", "label": "Post spacing, on center", "unit": "ft", "type": "number", "group": "options", "default": 8, "min": 2, "max": 12 }, { "name": "railsPerSection", "label": "Rails per section", "unit": "ea", "type": "select", "group": "options", "default": "3", "options": [ "2", "3", "4" ] }, { "name": "picketWidthIn", "label": "Picket width, actual", "unit": "in", "type": "number", "group": "options", "default": 5.5, "min": 1, "max": 12 }, { "name": "picketGapIn", "label": "Gap between pickets", "unit": "in", "type": "number", "group": "options", "default": 0, "min": 0, "max": 12, "help": "0 for a privacy fence." }, { "name": "holeDiaIn", "label": "Post hole diameter", "unit": "in", "type": "number", "group": "options", "default": 10, "min": 4, "max": 24 }, { "name": "holeDepthIn", "label": "Post hole depth", "unit": "in", "type": "number", "group": "options", "default": 24, "min": 6, "max": 72 }, { "name": "postSizeIn", "label": "Post width, actual", "unit": "in", "type": "number", "group": "options", "default": 3.5, "min": 1, "max": 8, "help": "A 4×4 is 3.5 in square." }, { "name": "bagYieldCuFt", "label": "Yield per 80 lb bag", "unit": "cu ft", "type": "number", "group": "options", "default": 0.6, "min": 0.1, "max": 2 }, { "name": "wastePct", "label": "Picket waste", "unit": "%", "type": "number", "group": "options", "default": 5, "min": 0, "max": 50 }, { "name": "pricePost", "label": "Post", "unit": "$/ea", "type": "number", "group": "prices", "default": 16, "min": 0, "priceKey": "fence_post" }, { "name": "priceRail", "label": "Rail", "unit": "$/ea", "type": "number", "group": "prices", "default": 6, "min": 0, "priceKey": "fence_rail" }, { "name": "pricePicket", "label": "Picket", "unit": "$/ea", "type": "number", "group": "prices", "default": 3.5, "min": 0, "priceKey": "fence_picket" }, { "name": "priceBag", "label": "80 lb concrete", "unit": "$/bag", "type": "number", "group": "prices", "default": 6.5, "min": 0, "priceKey": "concrete_bag_80" }, { "name": "spreadPct", "label": "Estimate range (±)", "unit": "%", "type": "number", "group": "prices", "default": 15, "min": 0, "max": 100 } ], "formulas": [ { "output": "sections", "text": "Sections = ⌈ fence length ÷ post spacing ⌉", "expr": "ceil(lengthFt/postSpacingFt)" }, { "output": "posts", "text": "Posts = sections + 1", "expr": "sections+1" }, { "output": "rails", "text": "Rails = sections × rails per section", "expr": "sections*railsPerSection" }, { "output": "pickets", "text": "Pickets = ⌈ length × 12 ÷ (picket width + gap) × (1 + waste ÷ 100) ⌉", "expr": "ceil(lengthFt*12/(picketWidthIn+picketGapIn)*(1+wastePct/100))" }, { "output": "concretePerHoleCuFt", "text": "Concrete per hole (cu ft) = π × (hole dia ÷ 24)² × (depth ÷ 12) − (post width ÷ 12)² × (depth ÷ 12)", "expr": "PI*(holeDiaIn/24)^2*(holeDepthIn/12)-(postSizeIn/12)^2*(holeDepthIn/12)" }, { "output": "bags", "text": "Bags = ⌈ posts × concrete per hole ÷ bag yield ⌉", "expr": "ceil(posts*concretePerHoleCuFt/bagYieldCuFt)" }, { "output": "postLengthFt", "text": "Minimum post length = fence height + hole depth ÷ 12", "expr": "heightFt+holeDepthIn/12" }, { "output": "cost", "text": "Cost = Σ (quantity × unit price); range = cost × (1 ± range % ÷ 100)", "expr": "sum(qty*unitPrice)*(1±spreadPct/100)" } ], "defaultResult": { "values": { "sections": 13, "posts": 14, "rails": 39, "pickets": 230, "concretePerHoleCuFt": 0.921, "concreteCuFt": 12.89, "bags": 22, "postLengthFt": 8 }, "groups": [ { "title": "Materials", "subtotal": 1406, "low": 1195.1, "high": 1616.9, "items": [ { "key": "fence_post", "label": "Posts, 8 ft (min. 8 ft)", "qty": 14, "unit": "ea", "unitPrice": 16, "cost": 224 }, { "key": "fence_rail", "label": "Rails, 8 ft", "qty": 39, "unit": "ea", "unitPrice": 6, "cost": 234 }, { "key": "fence_picket", "label": "Pickets, 6 ft", "qty": 230, "unit": "ea", "unitPrice": 3.5, "cost": 805 }, { "key": "concrete_bag_80", "label": "Concrete, 80 lb bags", "qty": 22, "unit": "bag", "unitPrice": 6.5, "cost": 143 } ] } ] } }, { "id": "concrete", "name": "Concrete Calculator", "url": "https://estimahome.com/concrete-calculator/", "category": "outdoor", "description": "Cubic yards and 60 lb or 80 lb bag counts for a slab or round footings.", "related": [ "https://estimahome.com/deck-calculator/", "https://estimahome.com/fence-calculator/", "https://estimahome.com/paver-calculator/" ], "guides": [ "https://estimahome.com/guides/concrete-10x10-slab-4-inch/" ], "inputs": [ { "name": "shape", "label": "Pour", "unit": "", "type": "select", "group": "size", "default": "slab", "options": [ "slab", "footings" ] }, { "name": "lengthFt", "label": "Slab length", "unit": "ft", "type": "number", "group": "size", "default": 10, "min": 0.5, "max": 500, "showWhen": { "shape": "slab" } }, { "name": "widthFt", "label": "Slab width", "unit": "ft", "type": "number", "group": "size", "default": 10, "min": 0.5, "max": 500, "showWhen": { "shape": "slab" } }, { "name": "thicknessIn", "label": "Slab thickness", "unit": "in", "type": "number", "group": "size", "default": 4, "min": 1, "max": 24, "showWhen": { "shape": "slab" } }, { "name": "count", "label": "Number of footings", "unit": "ea", "type": "number", "group": "size", "default": 6, "min": 1, "max": 500, "showWhen": { "shape": "footings" } }, { "name": "diameterIn", "label": "Footing diameter", "unit": "in", "type": "number", "group": "size", "default": 12, "min": 2, "max": 60, "showWhen": { "shape": "footings" } }, { "name": "depthIn", "label": "Footing depth", "unit": "in", "type": "number", "group": "size", "default": 36, "min": 2, "max": 120, "showWhen": { "shape": "footings" } }, { "name": "wastePct", "label": "Extra for spillage and grade", "unit": "%", "type": "number", "group": "options", "default": 10, "min": 0, "max": 50 }, { "name": "yield80", "label": "Yield per 80 lb bag", "unit": "cu ft", "type": "number", "group": "options", "default": 0.6, "min": 0.1, "max": 2, "help": "Printed on the bag." }, { "name": "yield60", "label": "Yield per 60 lb bag", "unit": "cu ft", "type": "number", "group": "options", "default": 0.45, "min": 0.1, "max": 2 }, { "name": "price80", "label": "80 lb bag", "unit": "$/bag", "type": "number", "group": "prices", "default": 6.5, "min": 0, "priceKey": "concrete_bag_80" }, { "name": "price60", "label": "60 lb bag", "unit": "$/bag", "type": "number", "group": "prices", "default": 5.25, "min": 0, "priceKey": "concrete_bag_60" }, { "name": "priceYard", "label": "Ready-mix", "unit": "$/cu yd", "type": "number", "group": "prices", "default": 175, "min": 0, "priceKey": "ready_mix_yard" }, { "name": "spreadPct", "label": "Estimate range (±)", "unit": "%", "type": "number", "group": "prices", "default": 15, "min": 0, "max": 100 } ], "formulas": [ { "output": "volumeCuFt", "text": "Slab (cu ft) = length × width × thickness ÷ 12", "expr": "lengthFt*widthFt*thicknessIn/12" }, { "output": "volumeCuFt", "text": "Footings (cu ft) = count × π × (diameter ÷ 24)² × (depth ÷ 12)", "expr": "count*PI*(diameterIn/24)^2*(depthIn/12)" }, { "output": "cubicYards", "text": "Cubic yards = cubic feet ÷ 27", "expr": "volumeCuFt/27" }, { "output": "orderCuFt", "text": "Order volume = volume × (1 + extra ÷ 100)", "expr": "volumeCuFt*(1+wastePct/100)" }, { "output": "bags80", "text": "80 lb bags = ⌈ order volume ÷ 80 lb yield ⌉", "expr": "ceil(orderCuFt/yield80)" }, { "output": "bags60", "text": "60 lb bags = ⌈ order volume ÷ 60 lb yield ⌉", "expr": "ceil(orderCuFt/yield60)" }, { "output": "readyMixYards", "text": "Ready-mix order = order yards rounded up to the next ¼ yd", "expr": "ceil(orderCuFt/27*4)/4" }, { "output": "cost", "text": "Cost per option = quantity × unit price; range = cost × (1 ± range % ÷ 100)", "expr": "qty*unitPrice*(1±spreadPct/100)" } ], "defaultResult": { "values": { "volumeCuFt": 33.33, "cubicYards": 1.23, "orderCuFt": 36.67, "orderYards": 1.36, "bags80": 62, "bags60": 82, "readyMixYards": 1.5 }, "groups": [ { "title": "Option A: 80 lb bags", "subtotal": 403, "low": 342.55, "high": 463.45, "items": [ { "key": "concrete_bag_80", "label": "Concrete mix, 80 lb", "qty": 62, "unit": "bag", "unitPrice": 6.5, "cost": 403 } ] }, { "title": "Option B: 60 lb bags", "subtotal": 430.5, "low": 365.93, "high": 495.08, "items": [ { "key": "concrete_bag_60", "label": "Concrete mix, 60 lb", "qty": 82, "unit": "bag", "unitPrice": 5.25, "cost": 430.5 } ] }, { "title": "Option C: ready-mix truck", "subtotal": 262.5, "low": 223.13, "high": 301.88, "items": [ { "key": "ready_mix_yard", "label": "Ready-mix concrete", "qty": 1.5, "unit": "cu yd", "unitPrice": 175, "cost": 262.5 } ] } ] } }, { "id": "pavers", "name": "Paver Patio Calculator", "url": "https://estimahome.com/paver-calculator/", "category": "outdoor", "description": "Pavers, compacted gravel base and bedding sand for a patio or walkway.", "related": [ "https://estimahome.com/retaining-wall-calculator/", "https://estimahome.com/gravel-calculator/", "https://estimahome.com/concrete-calculator/" ], "guides": [ "https://estimahome.com/guides/paver-patio-cost-12x12/" ], "inputs": [ { "name": "lengthFt", "label": "Patio length", "unit": "ft", "type": "number", "group": "size", "default": 12, "min": 1, "max": 500 }, { "name": "widthFt", "label": "Patio width", "unit": "ft", "type": "number", "group": "size", "default": 12, "min": 1, "max": 500 }, { "name": "paverLIn", "label": "Paver length", "unit": "in", "type": "number", "group": "size", "default": 8, "min": 2, "max": 48 }, { "name": "paverWIn", "label": "Paver width", "unit": "in", "type": "number", "group": "size", "default": 4, "min": 2, "max": 48 }, { "name": "wastePct", "label": "Paver waste", "unit": "%", "type": "number", "group": "options", "default": 5, "min": 0, "max": 30, "help": "5% for straight edges; 10% or more with curves." }, { "name": "baseDepthIn", "label": "Gravel base depth", "unit": "in", "type": "number", "group": "options", "default": 4, "min": 2, "max": 12, "help": "Patios commonly 4–6 in; driveways deeper." }, { "name": "sandDepthIn", "label": "Bedding sand depth", "unit": "in", "type": "number", "group": "options", "default": 1, "min": 0.5, "max": 2 }, { "name": "compactPct", "label": "Extra for compaction", "unit": "%", "type": "number", "group": "options", "default": 15, "min": 0, "max": 40 }, { "name": "sandBagCuFt", "label": "Sand bag size", "unit": "cu ft", "type": "number", "group": "options", "default": 0.5, "min": 0.1, "max": 2 }, { "name": "pricePaver", "label": "Paver", "unit": "$/ea", "type": "number", "group": "prices", "default": 0.75, "min": 0, "priceKey": "paver" }, { "name": "priceGravel", "label": "Gravel base, bulk", "unit": "$/cu yd", "type": "number", "group": "prices", "default": 55, "min": 0, "priceKey": "gravel_yard" }, { "name": "priceSand", "label": "Paver sand", "unit": "$/bag", "type": "number", "group": "prices", "default": 6, "min": 0, "priceKey": "paver_sand" }, { "name": "spreadPct", "label": "Estimate range (±)", "unit": "%", "type": "number", "group": "prices", "default": 15, "min": 0, "max": 100 } ], "formulas": [ { "output": "areaSqFt", "text": "Area = length × width", "expr": "lengthFt*widthFt" }, { "output": "pavers", "text": "Pavers = ⌈ area × 144 ÷ (paver L × paver W) × (1 + waste ÷ 100) ⌉", "expr": "ceil(areaSqFt*144/(paverLIn*paverWIn)*(1+wastePct/100))" }, { "output": "baseYd", "text": "Base (cu yd) = area × base depth ÷ 12 × (1 + compaction ÷ 100) ÷ 27, ordered to the next ½ yd", "expr": "ceil(areaSqFt*baseDepthIn/12*(1+compactPct/100)/27*2)/2" }, { "output": "sandBags", "text": "Sand bags = ⌈ area × sand depth ÷ 12 ÷ bag size ⌉", "expr": "ceil(areaSqFt*sandDepthIn/12/sandBagCuFt)" }, { "output": "cost", "text": "Cost = Σ (quantity × unit price); range = cost × (1 ± range % ÷ 100)", "expr": "sum(qty*unitPrice)*(1±spreadPct/100)" } ], "defaultResult": { "values": { "areaSqFt": 144, "pavers": 681, "baseCuYd": 2.044, "baseYd": 2.5, "sandCuFt": 12, "sandBags": 24 }, "groups": [ { "title": "Materials", "subtotal": 792.25, "low": 673.41, "high": 911.09, "items": [ { "key": "paver", "label": "Pavers, 8 × 4 in", "qty": 681, "unit": "ea", "unitPrice": 0.75, "cost": 510.75 }, { "key": "gravel_yard", "label": "Crushed stone base", "qty": 2.5, "unit": "cu yd", "unitPrice": 55, "cost": 137.5 }, { "key": "paver_sand", "label": "Paver sand, 0.5 cu ft", "qty": 24, "unit": "bag", "unitPrice": 6, "cost": 144 } ] } ] } }, { "id": "retaining-wall", "name": "Retaining Wall Calculator", "url": "https://estimahome.com/retaining-wall-calculator/", "category": "outdoor", "description": "Wall blocks, cap blocks, base gravel and drainage stone for a segmental block wall.", "related": [ "https://estimahome.com/paver-calculator/", "https://estimahome.com/gravel-calculator/", "https://estimahome.com/fence-calculator/" ], "guides": [ "https://estimahome.com/guides/retaining-wall-blocks-30-ft/" ], "inputs": [ { "name": "lengthFt", "label": "Wall length", "unit": "ft", "type": "number", "group": "size", "default": 30, "min": 1, "max": 1000 }, { "name": "heightFt", "label": "Wall height, incl. buried course", "unit": "ft", "type": "number", "group": "size", "default": 2, "min": 0.5, "max": 4, "help": "Walls over about 3–4 ft usually need an engineer." }, { "name": "blockLIn", "label": "Block face length", "unit": "in", "type": "number", "group": "options", "default": 16, "min": 4, "max": 36 }, { "name": "blockHIn", "label": "Block height", "unit": "in", "type": "number", "group": "options", "default": 6, "min": 2, "max": 12 }, { "name": "blockDIn", "label": "Block depth", "unit": "in", "type": "number", "group": "options", "default": 12, "min": 4, "max": 24 }, { "name": "capLIn", "label": "Cap length", "unit": "in", "type": "number", "group": "options", "default": 16, "min": 4, "max": 36 }, { "name": "baseDepthIn", "label": "Base gravel depth", "unit": "in", "type": "number", "group": "options", "default": 6, "min": 2, "max": 12 }, { "name": "trenchExtraIn", "label": "Trench width beyond block depth", "unit": "in", "type": "number", "group": "options", "default": 12, "min": 0, "max": 24 }, { "name": "drainWidthIn", "label": "Drainage stone behind wall", "unit": "in", "type": "number", "group": "options", "default": 12, "min": 0, "max": 24 }, { "name": "compactPct", "label": "Extra for compaction", "unit": "%", "type": "number", "group": "options", "default": 15, "min": 0, "max": 40 }, { "name": "wastePct", "label": "Block waste", "unit": "%", "type": "number", "group": "options", "default": 5, "min": 0, "max": 30 }, { "name": "priceBlock", "label": "Wall block", "unit": "$/ea", "type": "number", "group": "prices", "default": 6, "min": 0, "priceKey": "wall_block" }, { "name": "priceCap", "label": "Cap block", "unit": "$/ea", "type": "number", "group": "prices", "default": 5, "min": 0, "priceKey": "wall_cap" }, { "name": "priceGravel", "label": "Gravel, bulk", "unit": "$/cu yd", "type": "number", "group": "prices", "default": 55, "min": 0, "priceKey": "gravel_yard" }, { "name": "spreadPct", "label": "Estimate range (±)", "unit": "%", "type": "number", "group": "prices", "default": 15, "min": 0, "max": 100 } ], "formulas": [ { "output": "perCourse", "text": "Blocks per course = ⌈ length × 12 ÷ block length ⌉", "expr": "ceil(lengthFt*12/blockLIn)" }, { "output": "courses", "text": "Courses = ⌈ height × 12 ÷ block height ⌉", "expr": "ceil(heightFt*12/blockHIn)" }, { "output": "blocks", "text": "Blocks = ⌈ blocks per course × courses × (1 + waste ÷ 100) ⌉", "expr": "ceil(perCourse*courses*(1+wastePct/100))" }, { "output": "caps", "text": "Caps = ⌈ length × 12 ÷ cap length ⌉", "expr": "ceil(lengthFt*12/capLIn)" }, { "output": "baseYd", "text": "Base gravel (cu yd) = length × (block depth + trench extra) ÷ 12 × base depth ÷ 12 × (1 + compaction ÷ 100) ÷ 27", "expr": "lengthFt*(blockDIn+trenchExtraIn)/12*baseDepthIn/12*(1+compactPct/100)/27" }, { "output": "drainYd", "text": "Drainage stone (cu yd) = length × drain width ÷ 12 × height ÷ 27", "expr": "lengthFt*drainWidthIn/12*heightFt/27" }, { "output": "gravelOrderYd", "text": "Gravel order = base + drainage, rounded up to ½ yd", "expr": "ceil((baseYd+drainYd)*2)/2" }, { "output": "cost", "text": "Cost = Σ (quantity × unit price); range = cost × (1 ± range % ÷ 100)", "expr": "sum(qty*unitPrice)*(1±spreadPct/100)" } ], "defaultResult": { "values": { "perCourse": 23, "courses": 4, "blocks": 97, "caps": 23, "baseYd": 1.278, "drainYd": 2.222, "gravelOrderYd": 3.5 }, "groups": [ { "title": "Materials", "subtotal": 889.5, "low": 756.08, "high": 1022.93, "items": [ { "key": "wall_block", "label": "Wall block, 16 × 6 × 12 in", "qty": 97, "unit": "ea", "unitPrice": 6, "cost": 582 }, { "key": "wall_cap", "label": "Cap block", "qty": 23, "unit": "ea", "unitPrice": 5, "cost": 115 }, { "key": "gravel_yard", "label": "Crushed stone, base and drainage", "qty": 3.5, "unit": "cu yd", "unitPrice": 55, "cost": 192.5 } ] } ] } }, { "id": "mulch", "name": "Mulch Calculator", "url": "https://estimahome.com/mulch-calculator/", "category": "landscape", "description": "Cubic yards of mulch for a bed, and how many 2 cu ft bags that is versus bulk.", "related": [ "https://estimahome.com/topsoil-calculator/", "https://estimahome.com/gravel-calculator/" ], "guides": [ "https://estimahome.com/guides/how-many-bags-of-mulch/" ], "inputs": [ { "name": "lengthFt", "label": "Bed or area length", "unit": "ft", "type": "number", "group": "size", "default": 20, "min": 0.5, "max": 1000 }, { "name": "widthFt", "label": "Bed or area width", "unit": "ft", "type": "number", "group": "size", "default": 10, "min": 0.5, "max": 1000 }, { "name": "depthIn", "label": "Depth", "unit": "in", "type": "number", "group": "size", "default": 3, "min": 0.5, "max": 36 }, { "name": "extraPct", "label": "Extra for settling", "unit": "%", "type": "number", "group": "options", "default": 0, "min": 0, "max": 50 }, { "name": "bagCuFt", "label": "Bag size", "unit": "cu ft", "type": "number", "group": "options", "default": 2, "min": 0.1, "max": 5, "help": "Most bagged mulch is 2 cu ft." }, { "name": "tonsPerYd", "label": "Weight per cubic yard", "unit": "tons", "type": "number", "group": "options", "default": 0.4, "min": 0.1, "max": 3, "help": "Ask your supplier; moisture changes it." }, { "name": "bulkIncrementYd", "label": "Bulk sold in increments of", "unit": "cu yd", "type": "select", "group": "options", "default": "0.5", "options": [ "0.25", "0.5", "1" ] }, { "name": "priceBag", "label": "Bag", "unit": "$/bag", "type": "number", "group": "prices", "default": 4.5, "min": 0, "priceKey": "mulch_bag" }, { "name": "priceYard", "label": "Bulk", "unit": "$/cu yd", "type": "number", "group": "prices", "default": 40, "min": 0, "priceKey": "mulch_yard" }, { "name": "priceDelivery", "label": "Bulk delivery", "unit": "$", "type": "number", "group": "prices", "default": 75, "min": 0, "priceKey": "bulk_delivery" }, { "name": "spreadPct", "label": "Estimate range (±)", "unit": "%", "type": "number", "group": "prices", "default": 15, "min": 0, "max": 100 } ], "formulas": [ { "output": "cuFt", "text": "Volume (cu ft) = length × width × depth ÷ 12 × (1 + extra ÷ 100)", "expr": "lengthFt*widthFt*depthIn/12*(1+extraPct/100)" }, { "output": "cuYd", "text": "Cubic yards = cubic feet ÷ 27", "expr": "cuFt/27" }, { "output": "bags", "text": "Bags = ⌈ cubic feet ÷ bag size ⌉", "expr": "ceil(cuFt/bagCuFt)" }, { "output": "bulkYd", "text": "Bulk order = cubic yards rounded up to the sale increment", "expr": "ceil(cuYd/bulkIncrementYd)*bulkIncrementYd" }, { "output": "tons", "text": "Weight (tons) = cubic yards × tons per cubic yard", "expr": "cuYd*tonsPerYd" }, { "output": "cost", "text": "Bag cost = bags × bag price; bulk cost = bulk yards × price per yard + delivery; range = cost × (1 ± range % ÷ 100)", "expr": "qty*unitPrice*(1±spreadPct/100)" } ], "defaultResult": { "values": { "areaSqFt": 200, "cuFt": 50, "cuYd": 1.85, "bags": 25, "bulkYd": 2, "tons": 0.74 }, "groups": [ { "title": "Option A: bagged", "subtotal": 112.5, "low": 95.63, "high": 129.38, "items": [ { "key": "mulch_bag", "label": "Mulch, 2 cu ft bags", "qty": 25, "unit": "bag", "unitPrice": 4.5, "cost": 112.5 } ] }, { "title": "Option B: bulk delivery", "subtotal": 155, "low": 131.75, "high": 178.25, "items": [ { "key": "mulch_yard", "label": "Mulch, bulk", "qty": 2, "unit": "cu yd", "unitPrice": 40, "cost": 80 }, { "key": "bulk_delivery", "label": "Delivery", "qty": 1, "unit": "trip", "unitPrice": 75, "cost": 75 } ] } ] } }, { "id": "gravel", "name": "Gravel Calculator", "url": "https://estimahome.com/gravel-calculator/", "category": "landscape", "description": "Cubic yards and tons of gravel or crushed stone for a path, pad or driveway.", "related": [ "https://estimahome.com/paver-calculator/", "https://estimahome.com/retaining-wall-calculator/", "https://estimahome.com/mulch-calculator/" ], "guides": [ "https://estimahome.com/guides/gravel-driveway-50-ft/" ], "inputs": [ { "name": "lengthFt", "label": "Bed or area length", "unit": "ft", "type": "number", "group": "size", "default": 20, "min": 0.5, "max": 1000 }, { "name": "widthFt", "label": "Bed or area width", "unit": "ft", "type": "number", "group": "size", "default": 10, "min": 0.5, "max": 1000 }, { "name": "depthIn", "label": "Depth", "unit": "in", "type": "number", "group": "size", "default": 4, "min": 0.5, "max": 36 }, { "name": "extraPct", "label": "Extra for settling", "unit": "%", "type": "number", "group": "options", "default": 0, "min": 0, "max": 50 }, { "name": "bagCuFt", "label": "Bag size", "unit": "cu ft", "type": "number", "group": "options", "default": 0.5, "min": 0.1, "max": 5, "help": "Bagged gravel is often 0.5 cu ft (about 50 lb)." }, { "name": "tonsPerYd", "label": "Weight per cubic yard", "unit": "tons", "type": "number", "group": "options", "default": 1.4, "min": 0.1, "max": 3, "help": "Ask your supplier; moisture changes it." }, { "name": "bulkIncrementYd", "label": "Bulk sold in increments of", "unit": "cu yd", "type": "select", "group": "options", "default": "0.5", "options": [ "0.25", "0.5", "1" ] }, { "name": "priceBag", "label": "Bag", "unit": "$/bag", "type": "number", "group": "prices", "default": 6, "min": 0, "priceKey": "gravel_bag" }, { "name": "priceYard", "label": "Bulk", "unit": "$/cu yd", "type": "number", "group": "prices", "default": 55, "min": 0, "priceKey": "gravel_yard" }, { "name": "priceDelivery", "label": "Bulk delivery", "unit": "$", "type": "number", "group": "prices", "default": 75, "min": 0, "priceKey": "bulk_delivery" }, { "name": "spreadPct", "label": "Estimate range (±)", "unit": "%", "type": "number", "group": "prices", "default": 15, "min": 0, "max": 100 } ], "formulas": [ { "output": "cuFt", "text": "Volume (cu ft) = length × width × depth ÷ 12 × (1 + extra ÷ 100)", "expr": "lengthFt*widthFt*depthIn/12*(1+extraPct/100)" }, { "output": "cuYd", "text": "Cubic yards = cubic feet ÷ 27", "expr": "cuFt/27" }, { "output": "bags", "text": "Bags = ⌈ cubic feet ÷ bag size ⌉", "expr": "ceil(cuFt/bagCuFt)" }, { "output": "bulkYd", "text": "Bulk order = cubic yards rounded up to the sale increment", "expr": "ceil(cuYd/bulkIncrementYd)*bulkIncrementYd" }, { "output": "tons", "text": "Weight (tons) = cubic yards × tons per cubic yard", "expr": "cuYd*tonsPerYd" }, { "output": "cost", "text": "Bag cost = bags × bag price; bulk cost = bulk yards × price per yard + delivery; range = cost × (1 ± range % ÷ 100)", "expr": "qty*unitPrice*(1±spreadPct/100)" } ], "defaultResult": { "values": { "areaSqFt": 200, "cuFt": 66.67, "cuYd": 2.47, "bags": 134, "bulkYd": 2.5, "tons": 3.46 }, "groups": [ { "title": "Option A: bagged", "subtotal": 804, "low": 683.4, "high": 924.6, "items": [ { "key": "gravel_bag", "label": "Gravel, 0.5 cu ft bags", "qty": 134, "unit": "bag", "unitPrice": 6, "cost": 804 } ] }, { "title": "Option B: bulk delivery", "subtotal": 212.5, "low": 180.63, "high": 244.37, "items": [ { "key": "gravel_yard", "label": "Gravel, bulk", "qty": 2.5, "unit": "cu yd", "unitPrice": 55, "cost": 137.5 }, { "key": "bulk_delivery", "label": "Delivery", "qty": 1, "unit": "trip", "unitPrice": 75, "cost": 75 } ] } ] } }, { "id": "topsoil", "name": "Topsoil Calculator", "url": "https://estimahome.com/topsoil-calculator/", "category": "landscape", "description": "Cubic yards of topsoil to fill a bed or level a lawn, bagged or bulk.", "related": [ "https://estimahome.com/mulch-calculator/", "https://estimahome.com/gravel-calculator/" ], "guides": [ "https://estimahome.com/guides/raised-bed-soil-4x8/" ], "inputs": [ { "name": "lengthFt", "label": "Bed or area length", "unit": "ft", "type": "number", "group": "size", "default": 20, "min": 0.5, "max": 1000 }, { "name": "widthFt", "label": "Bed or area width", "unit": "ft", "type": "number", "group": "size", "default": 10, "min": 0.5, "max": 1000 }, { "name": "depthIn", "label": "Depth", "unit": "in", "type": "number", "group": "size", "default": 4, "min": 0.5, "max": 36 }, { "name": "extraPct", "label": "Extra for settling", "unit": "%", "type": "number", "group": "options", "default": 0, "min": 0, "max": 50 }, { "name": "bagCuFt", "label": "Bag size", "unit": "cu ft", "type": "number", "group": "options", "default": 0.75, "min": 0.1, "max": 5, "help": "Bagged topsoil is often 0.75 or 1 cu ft." }, { "name": "tonsPerYd", "label": "Weight per cubic yard", "unit": "tons", "type": "number", "group": "options", "default": 1.1, "min": 0.1, "max": 3, "help": "Ask your supplier; moisture changes it." }, { "name": "bulkIncrementYd", "label": "Bulk sold in increments of", "unit": "cu yd", "type": "select", "group": "options", "default": "0.5", "options": [ "0.25", "0.5", "1" ] }, { "name": "priceBag", "label": "Bag", "unit": "$/bag", "type": "number", "group": "prices", "default": 3.5, "min": 0, "priceKey": "topsoil_bag" }, { "name": "priceYard", "label": "Bulk", "unit": "$/cu yd", "type": "number", "group": "prices", "default": 40, "min": 0, "priceKey": "topsoil_yard" }, { "name": "priceDelivery", "label": "Bulk delivery", "unit": "$", "type": "number", "group": "prices", "default": 75, "min": 0, "priceKey": "bulk_delivery" }, { "name": "spreadPct", "label": "Estimate range (±)", "unit": "%", "type": "number", "group": "prices", "default": 15, "min": 0, "max": 100 } ], "formulas": [ { "output": "cuFt", "text": "Volume (cu ft) = length × width × depth ÷ 12 × (1 + extra ÷ 100)", "expr": "lengthFt*widthFt*depthIn/12*(1+extraPct/100)" }, { "output": "cuYd", "text": "Cubic yards = cubic feet ÷ 27", "expr": "cuFt/27" }, { "output": "bags", "text": "Bags = ⌈ cubic feet ÷ bag size ⌉", "expr": "ceil(cuFt/bagCuFt)" }, { "output": "bulkYd", "text": "Bulk order = cubic yards rounded up to the sale increment", "expr": "ceil(cuYd/bulkIncrementYd)*bulkIncrementYd" }, { "output": "tons", "text": "Weight (tons) = cubic yards × tons per cubic yard", "expr": "cuYd*tonsPerYd" }, { "output": "cost", "text": "Bag cost = bags × bag price; bulk cost = bulk yards × price per yard + delivery; range = cost × (1 ± range % ÷ 100)", "expr": "qty*unitPrice*(1±spreadPct/100)" } ], "defaultResult": { "values": { "areaSqFt": 200, "cuFt": 66.67, "cuYd": 2.47, "bags": 89, "bulkYd": 2.5, "tons": 2.72 }, "groups": [ { "title": "Option A: bagged", "subtotal": 311.5, "low": 264.77, "high": 358.23, "items": [ { "key": "topsoil_bag", "label": "Topsoil, 0.75 cu ft bags", "qty": 89, "unit": "bag", "unitPrice": 3.5, "cost": 311.5 } ] }, { "title": "Option B: bulk delivery", "subtotal": 175, "low": 148.75, "high": 201.25, "items": [ { "key": "topsoil_yard", "label": "Topsoil, bulk", "qty": 2.5, "unit": "cu yd", "unitPrice": 40, "cost": 100 }, { "key": "bulk_delivery", "label": "Delivery", "qty": 1, "unit": "trip", "unitPrice": 75, "cost": 75 } ] } ] } }, { "id": "drywall", "name": "Drywall Calculator", "url": "https://estimahome.com/drywall-calculator/", "category": "interior", "description": "Drywall sheets, joint compound, tape and screws for a room.", "related": [ "https://estimahome.com/paint-calculator/", "https://estimahome.com/insulation-calculator/" ], "guides": [ "https://estimahome.com/guides/drywall-sheets-12x12-room/" ], "inputs": [ { "name": "lengthFt", "label": "Room length", "unit": "ft", "type": "number", "group": "size", "default": 12, "min": 1, "max": 200 }, { "name": "widthFt", "label": "Room width", "unit": "ft", "type": "number", "group": "size", "default": 12, "min": 1, "max": 200 }, { "name": "heightFt", "label": "Wall height", "unit": "ft", "type": "number", "group": "size", "default": 8, "min": 1, "max": 30 }, { "name": "includeCeiling", "label": "Hang the ceiling", "unit": "", "type": "select", "group": "size", "default": "1", "options": [ "0", "1" ] }, { "name": "doors", "label": "Doors", "unit": "ea", "type": "number", "group": "size", "default": 1, "min": 0, "max": 50 }, { "name": "windows", "label": "Windows", "unit": "ea", "type": "number", "group": "size", "default": 1, "min": 0, "max": 50 }, { "name": "sheet", "label": "Sheet size", "unit": "", "type": "select", "group": "options", "default": "32", "options": [ "32", "48" ] }, { "name": "wastePct", "label": "Waste", "unit": "%", "type": "number", "group": "options", "default": 10, "min": 0, "max": 50 }, { "name": "doorAreaSqFt", "label": "Area per door", "unit": "sq ft", "type": "number", "group": "options", "default": 21, "min": 0, "max": 100 }, { "name": "windowAreaSqFt", "label": "Area per window", "unit": "sq ft", "type": "number", "group": "options", "default": 15, "min": 0, "max": 100 }, { "name": "compoundGalPer1000", "label": "Joint compound per 1,000 sq ft", "unit": "gal", "type": "number", "group": "options", "default": 9.4, "min": 1, "max": 40, "help": "Ready-mixed, three coats. Check your product sheet." }, { "name": "bucketGal", "label": "Compound bucket size", "unit": "gal", "type": "number", "group": "options", "default": 4.5, "min": 0.5, "max": 10 }, { "name": "tapeFtPer1000", "label": "Tape per 1,000 sq ft", "unit": "ft", "type": "number", "group": "options", "default": 370, "min": 50, "max": 1000 }, { "name": "tapeRollFt", "label": "Tape roll length", "unit": "ft", "type": "number", "group": "options", "default": 250, "min": 50, "max": 1000 }, { "name": "screwsPerSheet", "label": "Screws per 4 × 8 sheet", "unit": "ea", "type": "number", "group": "options", "default": 32, "min": 10, "max": 80, "help": "Scaled for 4 × 12 sheets." }, { "name": "screwsPerBox", "label": "Screws per box", "unit": "ea", "type": "number", "group": "options", "default": 1000, "min": 50, "max": 10000 }, { "name": "priceSheet", "label": "Drywall sheet", "unit": "$/sheet", "type": "number", "group": "prices", "default": 16, "min": 0, "priceKey": "drywall_sheet", "help": "Use the price for the sheet size above." }, { "name": "priceBucket", "label": "Joint compound bucket", "unit": "$/ea", "type": "number", "group": "prices", "default": 20, "min": 0, "priceKey": "joint_compound" }, { "name": "priceTape", "label": "Paper tape roll", "unit": "$/roll", "type": "number", "group": "prices", "default": 5, "min": 0, "priceKey": "drywall_tape" }, { "name": "priceScrewBox", "label": "Box of drywall screws", "unit": "$/box", "type": "number", "group": "prices", "default": 22, "min": 0, "priceKey": "drywall_screws" }, { "name": "spreadPct", "label": "Estimate range (±)", "unit": "%", "type": "number", "group": "prices", "default": 15, "min": 0, "max": 100 } ], "formulas": [ { "output": "wallAreaSqFt", "text": "Wall area = 2 × (length + width) × height − doors × door area − windows × window area", "expr": "max(0,2*(lengthFt+widthFt)*heightFt-doors*doorAreaSqFt-windows*windowAreaSqFt)" }, { "output": "totalAreaSqFt", "text": "Total area = wall area + ceiling (length × width, if hung)", "expr": "wallAreaSqFt+(includeCeiling?lengthFt*widthFt:0)" }, { "output": "sheets", "text": "Sheets = ⌈ total area × (1 + waste ÷ 100) ÷ sheet area ⌉", "expr": "ceil(totalAreaSqFt*(1+wastePct/100)/sheet)" }, { "output": "buckets", "text": "Compound buckets = ⌈ total area ÷ 1,000 × compound rate ÷ bucket size ⌉", "expr": "ceil(totalAreaSqFt/1000*compoundGalPer1000/bucketGal)" }, { "output": "tapeRolls", "text": "Tape rolls = ⌈ total area ÷ 1,000 × tape rate ÷ roll length ⌉", "expr": "ceil(totalAreaSqFt/1000*tapeFtPer1000/tapeRollFt)" }, { "output": "screws", "text": "Screws = sheets × screws per sheet × (sheet area ÷ 32); boxes = ⌈ screws ÷ per box ⌉", "expr": "ceil(sheets*screwsPerSheet*sheet/32)" }, { "output": "cost", "text": "Cost = Σ (quantity × unit price); range = cost × (1 ± range % ÷ 100)", "expr": "sum(qty*unitPrice)*(1±spreadPct/100)" } ], "defaultResult": { "values": { "wallAreaSqFt": 348, "ceilingAreaSqFt": 144, "totalAreaSqFt": 492, "sheets": 17, "compoundGal": 4.62, "buckets": 2, "tapeFt": 182, "tapeRolls": 1, "screws": 544, "screwBoxes": 1 }, "groups": [ { "title": "Materials", "subtotal": 339, "low": 288.15, "high": 389.85, "items": [ { "key": "drywall_sheet", "label": "Drywall, 4 × 8 ft, 1/2 in", "qty": 17, "unit": "sheet", "unitPrice": 16, "cost": 272 }, { "key": "joint_compound", "label": "Joint compound, 4.5 gal", "qty": 2, "unit": "ea", "unitPrice": 20, "cost": 40 }, { "key": "drywall_tape", "label": "Paper tape, 250 ft", "qty": 1, "unit": "roll", "unitPrice": 5, "cost": 5 }, { "key": "drywall_screws", "label": "Drywall screws (544 pcs)", "qty": 1, "unit": "box", "unitPrice": 22, "cost": 22 } ] } ] } }, { "id": "paint", "name": "Paint Calculator", "url": "https://estimahome.com/paint-calculator/", "category": "interior", "description": "Gallons of wall paint, ceiling paint and primer for a room.", "related": [ "https://estimahome.com/drywall-calculator/", "https://estimahome.com/wallpaper-calculator/" ], "guides": [ "https://estimahome.com/guides/paint-12x12-room/" ], "inputs": [ { "name": "lengthFt", "label": "Room length", "unit": "ft", "type": "number", "group": "size", "default": 12, "min": 1, "max": 200 }, { "name": "widthFt", "label": "Room width", "unit": "ft", "type": "number", "group": "size", "default": 12, "min": 1, "max": 200 }, { "name": "heightFt", "label": "Wall height", "unit": "ft", "type": "number", "group": "size", "default": 8, "min": 1, "max": 40 }, { "name": "doors", "label": "Doors", "unit": "ea", "type": "number", "group": "size", "default": 1, "min": 0, "max": 50 }, { "name": "windows", "label": "Windows", "unit": "ea", "type": "number", "group": "size", "default": 2, "min": 0, "max": 50 }, { "name": "coats", "label": "Coats", "unit": "", "type": "select", "group": "options", "default": "2", "options": [ "1", "2", "3" ] }, { "name": "includeCeiling", "label": "Paint the ceiling", "unit": "", "type": "select", "group": "options", "default": "0", "options": [ "0", "1" ] }, { "name": "primer", "label": "One coat of primer", "unit": "", "type": "select", "group": "options", "default": "0", "options": [ "0", "1" ] }, { "name": "coverageSqFt", "label": "Paint coverage", "unit": "sq ft/gal", "type": "number", "group": "options", "default": 350, "min": 50, "max": 800, "help": "From the can label." }, { "name": "primerCoverageSqFt", "label": "Primer coverage", "unit": "sq ft/gal", "type": "number", "group": "options", "default": 300, "min": 50, "max": 800 }, { "name": "doorAreaSqFt", "label": "Area per door", "unit": "sq ft", "type": "number", "group": "options", "default": 21, "min": 0, "max": 100, "help": "3 × 7 ft door." }, { "name": "windowAreaSqFt", "label": "Area per window", "unit": "sq ft", "type": "number", "group": "options", "default": 15, "min": 0, "max": 100, "help": "3 × 5 ft window." }, { "name": "pricePaint", "label": "Paint", "unit": "$/gal", "type": "number", "group": "prices", "default": 42, "min": 0, "priceKey": "paint_gallon" }, { "name": "pricePrimer", "label": "Primer", "unit": "$/gal", "type": "number", "group": "prices", "default": 28, "min": 0, "priceKey": "primer_gallon" }, { "name": "priceSupplies", "label": "Rollers, tape, tray", "unit": "$", "type": "number", "group": "prices", "default": 35, "min": 0, "priceKey": "paint_supplies" }, { "name": "spreadPct", "label": "Estimate range (±)", "unit": "%", "type": "number", "group": "prices", "default": 15, "min": 0, "max": 100 } ], "formulas": [ { "output": "wallAreaSqFt", "text": "Wall area = 2 × (length + width) × height − doors × door area − windows × window area", "expr": "max(0,2*(lengthFt+widthFt)*heightFt-doors*doorAreaSqFt-windows*windowAreaSqFt)" }, { "output": "ceilingAreaSqFt", "text": "Ceiling area = length × width", "expr": "includeCeiling ? lengthFt*widthFt : 0" }, { "output": "paintGallons", "text": "Paint (gal) = (wall area + ceiling area) × coats ÷ coverage", "expr": "(wallAreaSqFt+ceilingAreaSqFt)*coats/coverageSqFt" }, { "output": "paintGallonsToBuy", "text": "Gallons to buy = ⌈ paint gallons ⌉", "expr": "ceil(paintGallons)" }, { "output": "primerGallons", "text": "Primer (gal) = ⌈ (wall area + ceiling area) ÷ primer coverage ⌉", "expr": "primer ? ceil((wallAreaSqFt+ceilingAreaSqFt)/primerCoverageSqFt) : 0" }, { "output": "cost", "text": "Cost = Σ (quantity × unit price); range = cost × (1 ± range % ÷ 100)", "expr": "sum(qty*unitPrice)*(1±spreadPct/100)" } ], "defaultResult": { "values": { "grossWallSqFt": 384, "wallAreaSqFt": 333, "ceilingAreaSqFt": 0, "paintArea": 333, "paintGallons": 1.9, "paintGallonsToBuy": 2, "primerGallons": 0 }, "groups": [ { "title": "Materials", "subtotal": 119, "low": 101.15, "high": 136.85, "items": [ { "key": "paint_gallon", "label": "Paint, 2 coats", "qty": 2, "unit": "gal", "unitPrice": 42, "cost": 84 }, { "key": "paint_supplies", "label": "Rollers, brushes, tape, tray", "qty": 1, "unit": "set", "unitPrice": 35, "cost": 35 } ] } ] } }, { "id": "wallpaper", "name": "Wallpaper Calculator", "url": "https://estimahome.com/wallpaper-calculator/", "category": "interior", "description": "Rolls of wallpaper by the strip method, with pattern repeat and trim allowance.", "related": [ "https://estimahome.com/paint-calculator/", "https://estimahome.com/drywall-calculator/" ], "guides": [ "https://estimahome.com/guides/wallpaper-rolls-12x12-room/" ], "inputs": [ { "name": "lengthFt", "label": "Room length", "unit": "ft", "type": "number", "group": "size", "default": 12, "min": 1, "max": 200 }, { "name": "widthFt", "label": "Room width", "unit": "ft", "type": "number", "group": "size", "default": 12, "min": 1, "max": 200 }, { "name": "heightFt", "label": "Wall height", "unit": "ft", "type": "number", "group": "size", "default": 8, "min": 1, "max": 30 }, { "name": "skipFt", "label": "Width of openings to skip", "unit": "ft", "type": "number", "group": "size", "default": 3, "min": 0, "max": 200, "help": "Doors and full-height openings only. Leave windows in." }, { "name": "rollWidthIn", "label": "Roll width", "unit": "in", "type": "number", "group": "options", "default": 20.5, "min": 10, "max": 60, "help": "US double rolls are usually 20.5 in × 33 ft." }, { "name": "rollLengthFt", "label": "Roll length", "unit": "ft", "type": "number", "group": "options", "default": 33, "min": 5, "max": 100 }, { "name": "repeatIn", "label": "Pattern repeat", "unit": "in", "type": "number", "group": "options", "default": 0, "min": 0, "max": 60, "help": "Printed on the label. 0 for random match." }, { "name": "trimIn", "label": "Trim allowance per strip", "unit": "in", "type": "number", "group": "options", "default": 4, "min": 0, "max": 12 }, { "name": "priceRoll", "label": "Wallpaper roll", "unit": "$/roll", "type": "number", "group": "prices", "default": 60, "min": 0, "priceKey": "wallpaper_roll" }, { "name": "priceTools", "label": "Smoother, knife, seam roller", "unit": "$", "type": "number", "group": "prices", "default": 20, "min": 0, "priceKey": "wallpaper_tools" }, { "name": "spreadPct", "label": "Estimate range (±)", "unit": "%", "type": "number", "group": "prices", "default": 15, "min": 0, "max": 100 } ], "formulas": [ { "output": "strips", "text": "Strips = ⌈ (2 × (length + width) − openings) × 12 ÷ roll width ⌉", "expr": "ceil((2*(lengthFt+widthFt)-skipFt)*12/rollWidthIn)" }, { "output": "stripLengthIn", "text": "Strip length = wall height × 12 + pattern repeat + trim", "expr": "heightFt*12+repeatIn+trimIn" }, { "output": "stripsPerRoll", "text": "Strips per roll = ⌊ roll length × 12 ÷ strip length ⌋", "expr": "floor(rollLengthFt*12/stripLengthIn)" }, { "output": "rolls", "text": "Rolls = ⌈ strips ÷ strips per roll ⌉", "expr": "ceil(strips/stripsPerRoll)" }, { "output": "cost", "text": "Cost = Σ (quantity × unit price); range = cost × (1 ± range % ÷ 100)", "expr": "sum(qty*unitPrice)*(1±spreadPct/100)" } ], "defaultResult": { "values": { "perimeterFt": 48, "coverFt": 45, "strips": 27, "stripLengthIn": 100, "stripsPerRoll": 3, "rolls": 9 }, "groups": [ { "title": "Materials", "subtotal": 560, "low": 476, "high": 644, "items": [ { "key": "wallpaper_roll", "label": "Wallpaper, 20.5 in × 33 ft", "qty": 9, "unit": "roll", "unitPrice": 60, "cost": 540 }, { "key": "wallpaper_tools", "label": "Smoother, knife, seam roller", "qty": 1, "unit": "set", "unitPrice": 20, "cost": 20 } ] } ] } }, { "id": "insulation", "name": "Insulation Calculator", "url": "https://estimahome.com/insulation-calculator/", "category": "interior", "description": "Packages of fiberglass batts or rolls for walls, floors or an attic, adjusted for framing.", "related": [ "https://estimahome.com/drywall-calculator/", "https://estimahome.com/roofing-calculator/" ], "guides": [ "https://estimahome.com/guides/r13-insulation-1000-sq-ft-wall/" ], "inputs": [ { "name": "lengthFt", "label": "Wall length (or attic length)", "unit": "ft", "type": "number", "group": "size", "default": 40, "min": 1, "max": 1000 }, { "name": "heightFt", "label": "Wall height (or attic width)", "unit": "ft", "type": "number", "group": "size", "default": 8, "min": 1, "max": 200 }, { "name": "openingsSqFt", "label": "Windows and doors to subtract", "unit": "sq ft", "type": "number", "group": "size", "default": 30, "min": 0, "max": 10000 }, { "name": "rValue", "label": "R-value", "unit": "", "type": "select", "group": "size", "default": "13", "options": [ "13", "15", "19", "21", "30", "38", "49" ] }, { "name": "spacingIn", "label": "Stud or joist spacing, on center", "unit": "in", "type": "select", "group": "options", "default": "16", "options": [ "16", "24" ] }, { "name": "frameIn", "label": "Framing member thickness", "unit": "in", "type": "number", "group": "options", "default": 1.5, "min": 0.5, "max": 4 }, { "name": "packageSqFt", "label": "Coverage per package", "unit": "sq ft", "type": "number", "group": "options", "default": 40, "min": 1, "max": 200, "help": "Printed on the bag; it varies by R-value and width." }, { "name": "wastePct", "label": "Waste", "unit": "%", "type": "number", "group": "options", "default": 5, "min": 0, "max": 30 }, { "name": "pricePackage", "label": "Package", "unit": "$/pkg", "type": "number", "group": "prices", "default": 30, "min": 0, "priceKey": "insulation_package" }, { "name": "spreadPct", "label": "Estimate range (±)", "unit": "%", "type": "number", "group": "prices", "default": 15, "min": 0, "max": 100 } ], "formulas": [ { "output": "netSqFt", "text": "Net area = length × height − openings", "expr": "max(0,lengthFt*heightFt-openingsSqFt)" }, { "output": "cavityFraction", "text": "Cavity fraction = (spacing − framing thickness) ÷ spacing", "expr": "(spacingIn-frameIn)/spacingIn" }, { "output": "insulatedSqFt", "text": "Insulated area = net area × cavity fraction", "expr": "netSqFt*cavityFraction" }, { "output": "packages", "text": "Packages = ⌈ insulated area × (1 + waste ÷ 100) ÷ coverage per package ⌉", "expr": "ceil(insulatedSqFt*(1+wastePct/100)/packageSqFt)" }, { "output": "cost", "text": "Cost = Σ (quantity × unit price); range = cost × (1 ± range % ÷ 100)", "expr": "sum(qty*unitPrice)*(1±spreadPct/100)" } ], "defaultResult": { "values": { "netSqFt": 290, "cavityFraction": 0.9063, "insulatedSqFt": 262.81, "packages": 7 }, "groups": [ { "title": "Materials", "subtotal": 210, "low": 178.5, "high": 241.5, "items": [ { "key": "insulation_package", "label": "Fiberglass R-13, 15 in wide", "qty": 7, "unit": "pkg", "unitPrice": 30, "cost": 210 } ] } ] } }, { "id": "flooring", "name": "Flooring Calculator", "url": "https://estimahome.com/flooring-calculator/", "category": "floors", "description": "Boxes of laminate, vinyl plank or hardwood with waste, plus underlayment and trim.", "related": [ "https://estimahome.com/tile-calculator/", "https://estimahome.com/paint-calculator/" ], "guides": [ "https://estimahome.com/guides/laminate-flooring-cost-12x15/" ], "inputs": [ { "name": "lengthFt", "label": "Room length", "unit": "ft", "type": "number", "group": "size", "default": 15, "min": 1, "max": 200 }, { "name": "widthFt", "label": "Room width", "unit": "ft", "type": "number", "group": "size", "default": 12, "min": 1, "max": 200 }, { "name": "type", "label": "Flooring type", "unit": "", "type": "select", "group": "size", "default": "laminate", "options": [ "laminate", "lvp", "hardwood" ] }, { "name": "wastePct", "label": "Waste", "unit": "%", "type": "number", "group": "options", "default": 10, "min": 0, "max": 40, "help": "10% straight lay; 15% diagonal; 20% herringbone." }, { "name": "boxSqFt", "label": "Coverage per box", "unit": "sq ft", "type": "number", "group": "options", "default": 22, "min": 1, "max": 100, "help": "Printed on the box." }, { "name": "underlayment", "label": "Separate underlayment", "unit": "", "type": "select", "group": "options", "default": "1", "options": [ "0", "1" ], "help": "Skip if the planks have a pad attached." }, { "name": "underlaymentRollSqFt", "label": "Underlayment roll coverage", "unit": "sq ft", "type": "number", "group": "options", "default": 100, "min": 10, "max": 1000 }, { "name": "trim", "label": "Quarter round at walls", "unit": "", "type": "select", "group": "options", "default": "1", "options": [ "0", "1" ] }, { "name": "priceSqFt", "label": "Flooring", "unit": "$/sq ft", "type": "number", "group": "prices", "default": 3, "min": 0, "priceKey": "flooring_sqft" }, { "name": "priceUnderlayment", "label": "Underlayment roll", "unit": "$/roll", "type": "number", "group": "prices", "default": 30, "min": 0, "priceKey": "underlayment_roll" }, { "name": "priceTrim", "label": "Quarter round, 8 ft", "unit": "$/ea", "type": "number", "group": "prices", "default": 8, "min": 0, "priceKey": "quarter_round" }, { "name": "spreadPct", "label": "Estimate range (±)", "unit": "%", "type": "number", "group": "prices", "default": 15, "min": 0, "max": 100 } ], "formulas": [ { "output": "areaSqFt", "text": "Floor area = length × width", "expr": "lengthFt*widthFt" }, { "output": "boxes", "text": "Boxes = ⌈ area × (1 + waste ÷ 100) ÷ coverage per box ⌉", "expr": "ceil(areaSqFt*(1+wastePct/100)/boxSqFt)" }, { "output": "purchasedSqFt", "text": "Flooring bought = boxes × coverage per box (priced per sq ft)", "expr": "boxes*boxSqFt" }, { "output": "underlaymentRolls", "text": "Underlayment rolls = ⌈ area ÷ roll coverage ⌉", "expr": "ceil(areaSqFt/underlaymentRollSqFt)" }, { "output": "trimPieces", "text": "Quarter round = ⌈ 2 × (length + width) × 1.1 ÷ 8 ⌉ pieces", "expr": "ceil(2*(lengthFt+widthFt)*1.1/8)" }, { "output": "cost", "text": "Cost = Σ (quantity × unit price); range = cost × (1 ± range % ÷ 100)", "expr": "sum(qty*unitPrice)*(1±spreadPct/100)" } ], "defaultResult": { "values": { "areaSqFt": 180, "boxes": 9, "purchasedSqFt": 198, "underlaymentRolls": 2, "perimeterFt": 54, "trimPieces": 8 }, "groups": [ { "title": "Materials", "subtotal": 718, "low": 610.3, "high": 825.7, "items": [ { "key": "flooring_sqft", "label": "Laminate flooring, 9 boxes", "qty": 198, "unit": "sq ft", "unitPrice": 3, "cost": 594 }, { "key": "underlayment_roll", "label": "Underlayment, 100 sq ft roll", "qty": 2, "unit": "roll", "unitPrice": 30, "cost": 60 }, { "key": "quarter_round", "label": "Quarter round, 8 ft", "qty": 8, "unit": "ea", "unitPrice": 8, "cost": 64 } ] } ] } }, { "id": "tile", "name": "Tile Calculator", "url": "https://estimahome.com/tile-calculator/", "category": "floors", "description": "Tile count and boxes, thinset bags and grout for a floor or wall.", "related": [ "https://estimahome.com/flooring-calculator/", "https://estimahome.com/drywall-calculator/" ], "guides": [ "https://estimahome.com/guides/bathroom-floor-tile-cost/" ], "inputs": [ { "name": "lengthFt", "label": "Area length", "unit": "ft", "type": "number", "group": "size", "default": 10, "min": 0.5, "max": 200 }, { "name": "widthFt", "label": "Area width (or wall height)", "unit": "ft", "type": "number", "group": "size", "default": 12, "min": 0.5, "max": 200 }, { "name": "tileLIn", "label": "Tile length", "unit": "in", "type": "number", "group": "size", "default": 24, "min": 1, "max": 96 }, { "name": "tileWIn", "label": "Tile width", "unit": "in", "type": "number", "group": "size", "default": 12, "min": 1, "max": 96 }, { "name": "jointIn", "label": "Grout joint", "unit": "in", "type": "number", "group": "options", "default": 0.125, "min": 0, "max": 1 }, { "name": "tileThickIn", "label": "Tile thickness", "unit": "in", "type": "number", "group": "options", "default": 0.375, "min": 0.125, "max": 1.5 }, { "name": "wastePct", "label": "Waste", "unit": "%", "type": "number", "group": "options", "default": 10, "min": 0, "max": 40, "help": "Use 15% for diagonal layouts or lots of cuts." }, { "name": "boxSqFt", "label": "Coverage per box", "unit": "sq ft", "type": "number", "group": "options", "default": 16, "min": 1, "max": 100 }, { "name": "thinsetSqFtPerBag", "label": "Thinset coverage per 50 lb bag", "unit": "sq ft", "type": "number", "group": "options", "default": 45, "min": 10, "max": 150, "help": "Depends on trowel notch; see the bag chart." }, { "name": "groutDensity", "label": "Grout density", "unit": "lb/cu ft", "type": "number", "group": "options", "default": 112, "min": 50, "max": 160 }, { "name": "groutBagLb", "label": "Grout bag size", "unit": "lb", "type": "number", "group": "options", "default": 25, "min": 1, "max": 50 }, { "name": "priceSqFt", "label": "Tile", "unit": "$/sq ft", "type": "number", "group": "prices", "default": 3, "min": 0, "priceKey": "tile_sqft" }, { "name": "priceThinset", "label": "Thinset, 50 lb", "unit": "$/bag", "type": "number", "group": "prices", "default": 22, "min": 0, "priceKey": "thinset_bag" }, { "name": "priceGrout", "label": "Grout bag", "unit": "$/bag", "type": "number", "group": "prices", "default": 25, "min": 0, "priceKey": "grout_bag" }, { "name": "spreadPct", "label": "Estimate range (±)", "unit": "%", "type": "number", "group": "prices", "default": 15, "min": 0, "max": 100 } ], "formulas": [ { "output": "areaSqFt", "text": "Area = length × width", "expr": "lengthFt*widthFt" }, { "output": "tiles", "text": "Tiles = ⌈ area × 144 ÷ ((tile L + joint) × (tile W + joint)) × (1 + waste ÷ 100) ⌉", "expr": "ceil(areaSqFt*144/((tileLIn+jointIn)*(tileWIn+jointIn))*(1+wastePct/100))" }, { "output": "boxes", "text": "Boxes = ⌈ area × (1 + waste ÷ 100) ÷ coverage per box ⌉", "expr": "ceil(areaSqFt*(1+wastePct/100)/boxSqFt)" }, { "output": "thinsetBags", "text": "Thinset bags = ⌈ area ÷ coverage per bag ⌉", "expr": "ceil(areaSqFt/thinsetSqFtPerBag)" }, { "output": "groutLb", "text": "Grout (lb) = area × 144 × (1 ÷ tile L + 1 ÷ tile W) × joint × thickness ÷ 1,728 × density × (1 + waste ÷ 100)", "expr": "areaSqFt*144*(1/tileLIn+1/tileWIn)*jointIn*tileThickIn/1728*groutDensity*(1+wastePct/100)" }, { "output": "groutBags", "text": "Grout bags = ⌈ grout lb ÷ bag size ⌉", "expr": "ceil(groutLb/groutBagLb)" }, { "output": "cost", "text": "Cost = Σ (quantity × unit price); range = cost × (1 ± range % ÷ 100)", "expr": "sum(qty*unitPrice)*(1±spreadPct/100)" } ], "defaultResult": { "values": { "areaSqFt": 120, "tilesExact": 59.07, "tiles": 65, "boxes": 9, "purchasedSqFt": 144, "thinsetBags": 3, "groutLb": 7.22, "groutBags": 1 }, "groups": [ { "title": "Materials", "subtotal": 523, "low": 444.55, "high": 601.45, "items": [ { "key": "tile_sqft", "label": "Tile 24 × 12 in, 9 boxes", "qty": 144, "unit": "sq ft", "unitPrice": 3, "cost": 432 }, { "key": "thinset_bag", "label": "Thinset mortar, 50 lb", "qty": 3, "unit": "bag", "unitPrice": 22, "cost": 66 }, { "key": "grout_bag", "label": "Sanded grout, 25 lb", "qty": 1, "unit": "bag", "unitPrice": 25, "cost": 25 } ] } ] } }, { "id": "roofing", "name": "Roofing Calculator", "url": "https://estimahome.com/roofing-calculator/", "category": "roofing", "description": "Roof squares from footprint and pitch, then shingle bundles, underlayment, ridge cap and drip edge.", "related": [ "https://estimahome.com/insulation-calculator/", "https://estimahome.com/deck-calculator/" ], "guides": [ "https://estimahome.com/guides/shingles-2000-sq-ft-roof/" ], "inputs": [ { "name": "lengthFt", "label": "Roof length, incl. overhang", "unit": "ft", "type": "number", "group": "size", "default": 40, "min": 4, "max": 500, "help": "Along the ridge." }, { "name": "widthFt", "label": "Roof width, incl. overhang", "unit": "ft", "type": "number", "group": "size", "default": 30, "min": 4, "max": 300, "help": "Eave to eave." }, { "name": "pitch", "label": "Pitch (rise per 12 in)", "unit": "/12", "type": "select", "group": "size", "default": "6", "options": [ "2", "3", "4", "5", "6", "7", "8", "9", "10", "12" ] }, { "name": "style", "label": "Roof style", "unit": "", "type": "select", "group": "size", "default": "gable", "options": [ "gable", "hip" ] }, { "name": "wastePct", "label": "Shingle waste", "unit": "%", "type": "number", "group": "options", "default": 10, "min": 0, "max": 30, "help": "About 10% for gable, 15% for hip or cut-up roofs." }, { "name": "bundlesPerSquare", "label": "Bundles per square", "unit": "ea", "type": "number", "group": "options", "default": 3, "min": 1, "max": 6, "help": "Most architectural shingles: 3." }, { "name": "underlaymentRollSqFt", "label": "Underlayment roll coverage", "unit": "sq ft", "type": "number", "group": "options", "default": 1000, "min": 100, "max": 2000, "help": "Synthetic rolls are often 1,000 sq ft; #15 felt is 400." }, { "name": "ridgeLfPerBundle", "label": "Ridge cap per bundle", "unit": "lin ft", "type": "number", "group": "options", "default": 30, "min": 10, "max": 60 }, { "name": "priceBundle", "label": "Shingle bundle", "unit": "$/bundle", "type": "number", "group": "prices", "default": 38, "min": 0, "priceKey": "shingle_bundle" }, { "name": "priceUnderlayment", "label": "Underlayment roll", "unit": "$/roll", "type": "number", "group": "prices", "default": 95, "min": 0, "priceKey": "roof_underlayment" }, { "name": "priceRidge", "label": "Ridge cap bundle", "unit": "$/bundle", "type": "number", "group": "prices", "default": 60, "min": 0, "priceKey": "ridge_cap" }, { "name": "priceDrip", "label": "Drip edge, 10 ft", "unit": "$/ea", "type": "number", "group": "prices", "default": 9, "min": 0, "priceKey": "drip_edge" }, { "name": "spreadPct", "label": "Estimate range (±)", "unit": "%", "type": "number", "group": "prices", "default": 15, "min": 0, "max": 100 } ], "formulas": [ { "output": "pitchFactor", "text": "Pitch factor = √(1 + (rise ÷ 12)²)", "expr": "sqrt(1+(pitch/12)^2)" }, { "output": "roofAreaSqFt", "text": "Roof area = length × width × pitch factor", "expr": "lengthFt*widthFt*pitchFactor" }, { "output": "squares", "text": "Squares = roof area ÷ 100", "expr": "roofAreaSqFt/100" }, { "output": "bundles", "text": "Bundles = ⌈ squares × (1 + waste ÷ 100) × bundles per square ⌉", "expr": "ceil(squares*(1+wastePct/100)*bundlesPerSquare)" }, { "output": "underlaymentRolls", "text": "Underlayment rolls = ⌈ roof area × 1.1 ÷ roll coverage ⌉ (10% for laps)", "expr": "ceil(roofAreaSqFt*1.1/underlaymentRollSqFt)" }, { "output": "ridgeLf", "text": "Gable ridge = length. Hip: ridge = length − width, plus 4 hips of √(2 × (width ÷ 2)² + (width ÷ 2 × rise ÷ 12)²)", "expr": "style=='hip' ? (lengthFt-widthFt)+4*sqrt(2*(widthFt/2)^2+(widthFt/2*pitch/12)^2) : lengthFt" }, { "output": "ridgeBundles", "text": "Ridge cap bundles = ⌈ ridge + hips ÷ lin ft per bundle ⌉", "expr": "ceil(ridgeLf/ridgeLfPerBundle)" }, { "output": "dripEdgePieces", "text": "Drip edge = ⌈ (eaves + rakes) ÷ 10 ⌉. Gable: 2 × length + 4 × (width ÷ 2) × pitch factor. Hip: 2 × (length + width).", "expr": "ceil((style=='hip' ? 2*(lengthFt+widthFt) : 2*lengthFt+4*(widthFt/2)*pitchFactor)/10)" }, { "output": "cost", "text": "Cost = Σ (quantity × unit price); range = cost × (1 ± range % ÷ 100)", "expr": "sum(qty*unitPrice)*(1±spreadPct/100)" } ], "defaultResult": { "values": { "pitchFactor": 1.118, "roofAreaSqFt": 1341.64, "squares": 13.42, "bundles": 45, "underlaymentRolls": 2, "ridgeLf": 40, "ridgeBundles": 2, "edgeLf": 147.08, "dripEdgePieces": 15 }, "groups": [ { "title": "Materials", "subtotal": 2155, "low": 1831.75, "high": 2478.25, "items": [ { "key": "shingle_bundle", "label": "Architectural shingles", "qty": 45, "unit": "bundle", "unitPrice": 38, "cost": 1710 }, { "key": "roof_underlayment", "label": "Synthetic underlayment, 1000 sq ft", "qty": 2, "unit": "roll", "unitPrice": 95, "cost": 190 }, { "key": "ridge_cap", "label": "Hip and ridge cap shingles", "qty": 2, "unit": "bundle", "unitPrice": 60, "cost": 120 }, { "key": "drip_edge", "label": "Drip edge, 10 ft", "qty": 15, "unit": "ea", "unitPrice": 9, "cost": 135 } ] } ] } } ] }