# EstimaHome

> EstimaHome (estimahome.com) publishes free material and cost calculators for home projects. Each calculator runs in the browser, shows its formulas and a worked example, and rounds quantities up to purchasable units. Default prices are ballpark U.S. home-center figures that users replace with local prices; cite the formulas and quantities, and treat prices as adjustable assumptions.

- Machine-readable specs (inputs, defaults, formulas, default results): https://estimahome.com/api/calculators.json
- Default prices: https://estimahome.com/api/prices.json
- Full text of every calculator page: https://estimahome.com/llms-full.txt
- Inputs can be set by URL query parameters, e.g. https://estimahome.com/deck-calculator/?lengthFt=20&widthFt=12

## Decks, fences & hardscape

- [Deck Materials Calculator](https://estimahome.com/deck-calculator/): Deck boards, joists, screws, posts and footing concrete for a rectangular deck.
- [Fence Materials Calculator](https://estimahome.com/fence-calculator/): Posts, rails, pickets and post-hole concrete for a straight wood fence.
- [Concrete Calculator](https://estimahome.com/concrete-calculator/): Cubic yards and 60 lb or 80 lb bag counts for a slab or round footings.
- [Paver Patio Calculator](https://estimahome.com/paver-calculator/): Pavers, compacted gravel base and bedding sand for a patio or walkway.
- [Retaining Wall Calculator](https://estimahome.com/retaining-wall-calculator/): Wall blocks, cap blocks, base gravel and drainage stone for a segmental block wall.

## Landscaping

- [Mulch Calculator](https://estimahome.com/mulch-calculator/): Cubic yards of mulch for a bed, and how many 2 cu ft bags that is versus bulk.
- [Gravel Calculator](https://estimahome.com/gravel-calculator/): Cubic yards and tons of gravel or crushed stone for a path, pad or driveway.
- [Topsoil Calculator](https://estimahome.com/topsoil-calculator/): Cubic yards of topsoil to fill a bed or level a lawn, bagged or bulk.

## Walls & ceilings

- [Drywall Calculator](https://estimahome.com/drywall-calculator/): Drywall sheets, joint compound, tape and screws for a room.
- [Paint Calculator](https://estimahome.com/paint-calculator/): Gallons of wall paint, ceiling paint and primer for a room.
- [Wallpaper Calculator](https://estimahome.com/wallpaper-calculator/): Rolls of wallpaper by the strip method, with pattern repeat and trim allowance.
- [Insulation Calculator](https://estimahome.com/insulation-calculator/): Packages of fiberglass batts or rolls for walls, floors or an attic, adjusted for framing.

## Floors

- [Flooring Calculator](https://estimahome.com/flooring-calculator/): Boxes of laminate, vinyl plank or hardwood with waste, plus underlayment and trim.
- [Tile Calculator](https://estimahome.com/tile-calculator/): Tile count and boxes, thinset bags and grout for a floor or wall.

## Roofing

- [Roofing Calculator](https://estimahome.com/roofing-calculator/): Roof squares from footprint and pitch, then shingle bundles, underlayment, ridge cap and drip edge.

## Formulas

### Deck Materials Calculator
- Board rows = ⌈ depth × 12 ÷ (board width + gap) ⌉
- Decking linear feet = board rows × deck length
- Boards = ⌈ linear feet × (1 + waste ÷ 100) ÷ board length ⌉
- Joists = ⌊ length × 12 ÷ joist spacing ⌋ + 1
- Screws = board rows × joists × 2
- Screw boxes = ⌈ screws ÷ screws per box ⌉
- Footings = footing rows × (⌈ length ÷ post spacing ⌉ + 1)
- Footing concrete (cu ft) = footings × π × (diameter ÷ 24)² × (depth ÷ 12)
- Bags = ⌈ concrete ÷ bag yield ⌉
- Cost = Σ (quantity × unit price); range = cost × (1 ± range % ÷ 100)

### Fence Materials Calculator
- Sections = ⌈ fence length ÷ post spacing ⌉
- Posts = sections + 1
- Rails = sections × rails per section
- Pickets = ⌈ length × 12 ÷ (picket width + gap) × (1 + waste ÷ 100) ⌉
- Concrete per hole (cu ft) = π × (hole dia ÷ 24)² × (depth ÷ 12) − (post width ÷ 12)² × (depth ÷ 12)
- Bags = ⌈ posts × concrete per hole ÷ bag yield ⌉
- Minimum post length = fence height + hole depth ÷ 12
- Cost = Σ (quantity × unit price); range = cost × (1 ± range % ÷ 100)

### Concrete Calculator
- Slab (cu ft) = length × width × thickness ÷ 12
- Footings (cu ft) = count × π × (diameter ÷ 24)² × (depth ÷ 12)
- Cubic yards = cubic feet ÷ 27
- Order volume = volume × (1 + extra ÷ 100)
- 80 lb bags = ⌈ order volume ÷ 80 lb yield ⌉
- 60 lb bags = ⌈ order volume ÷ 60 lb yield ⌉
- Ready-mix order = order yards rounded up to the next ¼ yd
- Cost per option = quantity × unit price; range = cost × (1 ± range % ÷ 100)

### Paver Patio Calculator
- Area = length × width
- Pavers = ⌈ area × 144 ÷ (paver L × paver W) × (1 + waste ÷ 100) ⌉
- Base (cu yd) = area × base depth ÷ 12 × (1 + compaction ÷ 100) ÷ 27, ordered to the next ½ yd
- Sand bags = ⌈ area × sand depth ÷ 12 ÷ bag size ⌉
- Cost = Σ (quantity × unit price); range = cost × (1 ± range % ÷ 100)

### Retaining Wall Calculator
- Blocks per course = ⌈ length × 12 ÷ block length ⌉
- Courses = ⌈ height × 12 ÷ block height ⌉
- Blocks = ⌈ blocks per course × courses × (1 + waste ÷ 100) ⌉
- Caps = ⌈ length × 12 ÷ cap length ⌉
- Base gravel (cu yd) = length × (block depth + trench extra) ÷ 12 × base depth ÷ 12 × (1 + compaction ÷ 100) ÷ 27
- Drainage stone (cu yd) = length × drain width ÷ 12 × height ÷ 27
- Gravel order = base + drainage, rounded up to ½ yd
- Cost = Σ (quantity × unit price); range = cost × (1 ± range % ÷ 100)

### Mulch Calculator
- Volume (cu ft) = length × width × depth ÷ 12 × (1 + extra ÷ 100)
- Cubic yards = cubic feet ÷ 27
- Bags = ⌈ cubic feet ÷ bag size ⌉
- Bulk order = cubic yards rounded up to the sale increment
- Weight (tons) = cubic yards × tons per cubic yard
- Bag cost = bags × bag price; bulk cost = bulk yards × price per yard + delivery; range = cost × (1 ± range % ÷ 100)

### Gravel Calculator
- Volume (cu ft) = length × width × depth ÷ 12 × (1 + extra ÷ 100)
- Cubic yards = cubic feet ÷ 27
- Bags = ⌈ cubic feet ÷ bag size ⌉
- Bulk order = cubic yards rounded up to the sale increment
- Weight (tons) = cubic yards × tons per cubic yard
- Bag cost = bags × bag price; bulk cost = bulk yards × price per yard + delivery; range = cost × (1 ± range % ÷ 100)

### Topsoil Calculator
- Volume (cu ft) = length × width × depth ÷ 12 × (1 + extra ÷ 100)
- Cubic yards = cubic feet ÷ 27
- Bags = ⌈ cubic feet ÷ bag size ⌉
- Bulk order = cubic yards rounded up to the sale increment
- Weight (tons) = cubic yards × tons per cubic yard
- Bag cost = bags × bag price; bulk cost = bulk yards × price per yard + delivery; range = cost × (1 ± range % ÷ 100)

### Drywall Calculator
- Wall area = 2 × (length + width) × height − doors × door area − windows × window area
- Total area = wall area + ceiling (length × width, if hung)
- Sheets = ⌈ total area × (1 + waste ÷ 100) ÷ sheet area ⌉
- Compound buckets = ⌈ total area ÷ 1,000 × compound rate ÷ bucket size ⌉
- Tape rolls = ⌈ total area ÷ 1,000 × tape rate ÷ roll length ⌉
- Screws = sheets × screws per sheet × (sheet area ÷ 32); boxes = ⌈ screws ÷ per box ⌉
- Cost = Σ (quantity × unit price); range = cost × (1 ± range % ÷ 100)

### Paint Calculator
- Wall area = 2 × (length + width) × height − doors × door area − windows × window area
- Ceiling area = length × width
- Paint (gal) = (wall area + ceiling area) × coats ÷ coverage
- Gallons to buy = ⌈ paint gallons ⌉
- Primer (gal) = ⌈ (wall area + ceiling area) ÷ primer coverage ⌉
- Cost = Σ (quantity × unit price); range = cost × (1 ± range % ÷ 100)

### Wallpaper Calculator
- Strips = ⌈ (2 × (length + width) − openings) × 12 ÷ roll width ⌉
- Strip length = wall height × 12 + pattern repeat + trim
- Strips per roll = ⌊ roll length × 12 ÷ strip length ⌋
- Rolls = ⌈ strips ÷ strips per roll ⌉
- Cost = Σ (quantity × unit price); range = cost × (1 ± range % ÷ 100)

### Insulation Calculator
- Net area = length × height − openings
- Cavity fraction = (spacing − framing thickness) ÷ spacing
- Insulated area = net area × cavity fraction
- Packages = ⌈ insulated area × (1 + waste ÷ 100) ÷ coverage per package ⌉
- Cost = Σ (quantity × unit price); range = cost × (1 ± range % ÷ 100)

### Flooring Calculator
- Floor area = length × width
- Boxes = ⌈ area × (1 + waste ÷ 100) ÷ coverage per box ⌉
- Flooring bought = boxes × coverage per box (priced per sq ft)
- Underlayment rolls = ⌈ area ÷ roll coverage ⌉
- Quarter round = ⌈ 2 × (length + width) × 1.1 ÷ 8 ⌉ pieces
- Cost = Σ (quantity × unit price); range = cost × (1 ± range % ÷ 100)

### Tile Calculator
- Area = length × width
- Tiles = ⌈ area × 144 ÷ ((tile L + joint) × (tile W + joint)) × (1 + waste ÷ 100) ⌉
- Boxes = ⌈ area × (1 + waste ÷ 100) ÷ coverage per box ⌉
- Thinset bags = ⌈ area ÷ coverage per bag ⌉
- Grout (lb) = area × 144 × (1 ÷ tile L + 1 ÷ tile W) × joint × thickness ÷ 1,728 × density × (1 + waste ÷ 100)
- Grout bags = ⌈ grout lb ÷ bag size ⌉
- Cost = Σ (quantity × unit price); range = cost × (1 ± range % ÷ 100)

### Roofing Calculator
- Pitch factor = √(1 + (rise ÷ 12)²)
- Roof area = length × width × pitch factor
- Squares = roof area ÷ 100
- Bundles = ⌈ squares × (1 + waste ÷ 100) × bundles per square ⌉
- Underlayment rolls = ⌈ roof area × 1.1 ÷ roll coverage ⌉ (10% for laps)
- Gable ridge = length. Hip: ridge = length − width, plus 4 hips of √(2 × (width ÷ 2)² + (width ÷ 2 × rise ÷ 12)²)
- Ridge cap bundles = ⌈ ridge + hips ÷ lin ft per bundle ⌉
- Drip edge = ⌈ (eaves + rakes) ÷ 10 ⌉. Gable: 2 × length + 4 × (width ÷ 2) × pitch factor. Hip: 2 × (length + width).
- Cost = Σ (quantity × unit price); range = cost × (1 ± range % ÷ 100)

## Site

- [About](https://estimahome.com/about/): who runs the site, how calculators and prices are set
- [Terms](https://estimahome.com/terms/): reuse and citation