Construction calculators
Concrete, mulch, paint, lumber, dimensional weight, and renovation cost helpers.
All construction tools
31 tools, each runs locally in your browser. Click any card to open it.
CADR ≥ ⅔ × room ft² for 5 ACH. Wildfire smoke: ½ ft² for 8 ACH.
Attic Insulation R-Value takes length, area, volume, material rate and returns the matching attic insulation r-value r…
A Bathroom Remodel Cost Calculator computes bathroom remodel cost from the inputs you provide.
Brick Quantity Calculator takes length, area, volume, material rate and returns the matching brick quantity result. Ru…
Concrete Bag Calculator takes length, area, volume, material rate and returns the matching concrete bag result. Runs e…
Concrete Calculator takes length, area, volume, material rate and returns the matching concrete result. Runs entirely …
Concrete Volume Calculator takes length, area, volume, material rate and returns the matching concrete volume result. …
Square footage × material + labor + extras = total budget.
1 gallon stain covers ~250 ft² × 1 coat. Most decks need 2 coats.
Drywall Calculator takes length, area, volume, material rate and returns the matching drywall result. Runs entirely in…
Fence Cost Calculator takes length, area, volume, material rate and returns the matching fence cost result. Runs entir…
Convert any firewood stack into full cords and face cords.
Floor Tile Cost Calculator takes length, area, volume, material rate and returns the matching floor tile cost result. …
Gravel Calculator takes length, area, volume, material rate and returns the matching gravel result. Runs entirely in y…
Gutter Installation Cost Calculator takes length, area, volume, material rate and returns the matching gutter installa…
A Infant Growth Percentile Calculator computes infant growth percentile from the inputs you provide.
Kitchen Remodel Cost Calculator takes ingredient quantity, servings, temperature and returns the matching kitchen remo…
Lumber Board Feet Calculator takes length, area, volume, material rate and returns the matching lumber board feet resu…
Paint Coverage Calculator computes age in years/months/days from birth date, target date. Runs entirely in your browse…
Rebar Calculator takes length, area, volume, material rate and returns the matching rebar result. Runs entirely in you…
Rebar Spacing Calculator takes length, area, volume, material rate and returns the matching rebar spacing result. Runs…
Roofing Square Calculator takes source text, target style, optional rules and returns the matching roofing square resu…
Septic Tank Size Calculator takes length, area, volume, material rate and returns the matching septic tank size result…
Vinyl: $4-7/ft² · Fiber cement: $8-13 · Wood: $7-15 · Brick veneer: $10-20
Stair Calculator takes length, area, volume, material rate and returns the matching stair result. Runs entirely in you…
Stair Stringer Calculator takes length, area, volume, material rate and returns the matching stair stringer result. Ru…
Tile Calculator takes length, area, volume, material rate and returns the matching tile result. Runs entirely in your …
Tile Grout Calculator takes length, area, volume, material rate and returns the matching tile grout result. Runs entir…
Wallpaper Roll Calculator takes length, area, volume, material rate and returns the matching wallpaper roll result. Ru…
14 AWG: 15A · 12 AWG: 20A · 10 AWG: 30A · 8 AWG: 40A.
acres to square feet, 43560 sq ft, real estate land conversion acres to square feet converter free 3tej calculator
About construction
Construction calculators cover the volume, area, and material math homeowners and contractors run before every project: concrete by cubic yard / cubic meter, lumber board-feet, drywall sheets (4×8 and 4×12), paint coverage by square footage with primer + finish coats, roofing squares and bundles, deck board count by spacing, gravel and mulch by depth, firewood cords, insulation R-value, tile and grout per square footage, and stair rise/run for building code compliance.
Use these tools before a Home Depot or Lowe's run: how many 80 lb concrete bags for a 4×8 patio at 4 inches thick, how many 2×4×8 studs at 16 inches on center for a 12-foot wall, how many gallons of paint for a 2,000 sq ft house with 9-ft ceilings, how many shingles for a 30-square roof with a 6/12 pitch, or how much mulch (in cubic yards) for a 40-foot bed at 3 inches deep.
Sources: IRC (International Residential Code) for stair geometry and load tables, ASTM standards for concrete mixes, NRCA roofing references, Sherwin-Williams and Behr coverage rates. Defaults match standard US/metric trade practice; toggle units per project.
Common use cases
Real scenarios where the construction calculators in this category earn their keep.
Concrete for a patio or slab
Length × width × depth in feet, divided by 27 for cubic yards. The tool adds 10% waste and converts to 80 lb bag count for small jobs.
Paint by room
Wall area minus doors and windows, divided by coverage rate (typically 350 sq ft/gallon). The tool handles primer + 2 finish coats and ceiling separately.
Deck framing
Joist spacing (12, 16, 24 in OC), board count, fastener count, and total board-feet of pressure-treated lumber for any rectangular deck footprint.
Roof shingles by square
1 square = 100 sq ft of roof surface. The calculator handles pitch (slope multiplier), valley waste, and starter-strip math.
Stair rise and run
Total floor-to-floor height divided into 7-7.75 inch risers per IRC. Compute the corresponding tread depth (10-11 in) and total run length.
Key terms
Glossary for the formulas and conventions these tools use.
- Cubic yard
- 27 cubic feet (3×3×3). Standard unit for concrete, mulch, gravel, and topsoil delivery in the US.
- Board foot
- 144 cubic inches of lumber (1×12×12 inches). Used to price hardwood and rough-sawn lumber, distinct from linear feet.
- Square (roofing)
- 100 square feet of roof surface. Asphalt shingles are sold by the square or per bundle (3 bundles per square typically).
- Pitch
- Rise per 12 inches of run. A 6/12 pitch rises 6 inches over a 12-inch horizontal run. Affects shingle count and walkability.
- On-center (OC)
- Distance between framing members measured center-to-center. Standard residential framing is 16 in OC for walls, 16 or 24 in OC for joists.
- R-value
- Thermal resistance of insulation. Higher = better. R-19 batts fit 2×6 walls, R-13 fits 2×4 walls, R-49 is typical attic standard in cold climates.
- Riser / tread
- Vertical / horizontal portion of a stair step. IRC requires 4-7.75 inch risers and 10+ inch treads for residential stairs.
Frequently asked questions
Short answers to the most common construction questions.