Free Construction Calculators
Free construction calculators for concrete, framing, roofing, drywall, paint, and more. Instant material takeoffs — no signup. Built for contractors and DIY.
23 free calculators · No account required
Concrete Volume Calculator
Estimate cubic yards, cubic meters, and pre-mixed bag counts for slabs, driveways, and pads.
- Cubic yards & cubic meters output
- 60 lb and 80 lb bag count estimates
Board Feet Calculator
Calculate board feet for hardwood, rough-sawn, and dimensional lumber takeoffs.
- Per-piece and total board feet output
- Multi-piece quantity with waste margin
Drywall Sheet & Screw Estimator
Calculate sheet counts for walls and ceilings with a full material breakdown for your drywall job.
- Sheet count by wall dimensions or total area
- Screws, joint tape, and ready-mix mud estimates
Roofing Shingle Calculator
Estimate roofing squares and shingle bundles from footprint dimensions with pitch correction and waste margin.
- Pitch-adjusted surface area (2/12 to 12/12)
- Roofing squares and bundle count output
Tile Spacing & Coverage Calculator
Estimate tile counts from room dimensions with grout joint spacing and adjustable waste margin.
- Square footage with grout matrix expansion
- Total tiles and optional box count
Paint Coverage Calculator
Estimate gallons and quarts from room dimensions with door and window deductions and adjustable spread rate.
- Wall surface area with standard opening deductions
- Gallon and quart output with multi-coat math
Insulation R-Value Calculator
Calculate achieved R-value from insulation thickness and find additional inches needed to hit code targets.
- Six material types — batt, blown-in, spray foam, rigid foam
- Target R-value slider from R-13 walls to R-60 ceilings
Deck Joist Spacing Calculator
Estimate joist count, rim joist linear footage, and 16 ft board quantities for deck framing layouts.
- Joist count at 12", 16", or 24" on-center spacing
- Rim joist linear footage included in takeoff
Stair Stringer Calculator
Calculate riser count, total run, stringer length, and incline angle from total rise with IRC code compliance check.
- Riser count from target riser height
- Stringer hypotenuse and incline angle
Asphalt Driveway Cost Estimator
Estimate hot-mix asphalt tonnage, gravel subbase material, and total installed paving cost from driveway dimensions.
- Surface area and asphalt tonnage output
- Regional cost tiers from $7–$13/sq ft
Rebar Calculator
Free rebar calculator for concrete slabs. Enter slab size and spacing to get linear footage, stick counts, and waste.
- 20 ft rebar stick count with waste margin
- Total linear footage for grid layouts
Framing Lumber & Stud Count Calculator
Plan stud spacing, wall lengths, and lumber quantities for residential framing projects.
- Stud count by wall length and spacing
- Top and bottom plate linear footage
Excavation & Backfill Volume Calculator
Calculate bank, loose, and compacted cubic yards for excavation and backfill takeoffs with swell and shrink modeling.
- BCY, LCY, and CCY volume output
- Swell and shrink factor modeling
Siding Calculator
Free siding calculator for vinyl and fiber cement. Estimate squares, boxes, and waste from wall dimensions.
- Opening count and average area deductions
- Adjustable waste factor for cuts and breakage
Fence Post & Material Calculator
Calculate fence posts, picket infill, rail footage, and concrete bags for a straight fence run from length and spacing inputs.
- Post count via the plus-one end-cap rule
- Picket infill with custom width and gap spacing
Concrete Block & Mortar Calculator
Estimate CMU block count, mortar bags, and optional core fill volume for hollow block walls from wall dimensions and waste factor.
- Block count with adjustable waste factor
- 80 lb mortar bag estimation (~11 blocks per bag)
Paver Calculator
Free paver patio calculator with base gravel and bedding sand estimates for patios and driveways.
- Paver count with base gravel and bedding sand in cu yd and tons
- Smart warnings for base depth and waste margin settings
Footing & Foundation Concrete Calculator
Calculate concrete volume and bag counts for footings and foundations. Includes waste factor. Ideal for decks, houses, and structural concrete planning.
- Volume per footing, total cubic feet, and cubic yards
- 60 lb and 80 lb bag counts for ready-mix and DIY pours
Retaining Wall Block & Backfill Calculator
Estimate blocks, backfill gravel, and tonnage for retaining walls.
- Block count with adjustable waste margin
- Backfill volume in cu ft and cu yd
Plywood Roof Sheathing Calculator
Calculate plywood or OSB roof sheathing panels from area with waste factor.
- Supports custom panel sizes
- Waste factor included
Gravel Driveway Calculator
Free gravel driveway calculator for cubic yards, tonnage, and delivery estimates.
- Cubic feet and cubic yards
- Tonnage from gravel density
Mulch & Landscape Bed Calculator
Estimate mulch volume, cubic yards, and weight for landscape beds.
- Cubic feet and cubic yards
- Weight in pounds and tons
Gutter & Downspout Length Calculator
Estimate gutter length, downspout height, and total linear footage.
- Gutter + downspout length
- Waste factor included
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