Project calculators · US units · Free

Measure once.
Buy the right amount.

Concrete, gravel, soil, mulch, tile, drywall, paint, roofing, fences and stairs. Enter your measurements and get estimated quantities and a shopping list. Counts are rounded up to whole units you can actually buy. Every page shows its main formulas and sources.

Try:Concrete SlabFenceStairTileTopsoil

Calculators

  1. Concrete Slab CalculatorCalculate how much concrete you need for a slab, patio or pad: cubic yards, 40/60/80 lb bags, control joints and cost for bags vs. ready-mix.10 × 10 ft patio, 4 in, +10% → 1.36 yd³ = 62 × 80 lb bags
  2. Fence CalculatorEstimate a wood fence: posts, rails, pickets (gates included), concrete bags per post hole, hole base and material cost for privacy or picket fences.150 ft privacy fence → 22 posts
  3. Stair CalculatorCalculate stair risers, treads, total run and stringer length from your total rise, with exact riser height in 1/16 in, IRC checks and DCA 6 deck-stair checks.108 in rise → 14 risers of 7 11/16"
  4. Tile CalculatorWork out how many tiles and boxes you need for a floor, wall or shower - with grout joints, layout waste, thinset bags, grout and cost.12 × 10 ft room, 12×12 tile → 130 tiles
  5. Topsoil & Dirt CalculatorCalculate how much topsoil, fill dirt, garden soil or compost you need: cubic yards, tons, number of bags and cost of bulk delivery vs. bags.20 × 15 ft lawn, 4 in → 4.1 yd³
  6. Gravel CalculatorCalculate gravel in cubic yards and tons for pea gravel, #57 crushed stone, crusher run base or river rock, plus bags and bulk vs. bagged cost.20 × 10 ft, 3 in pea gravel → 1.85 yd³ ≈ 2.4-3 tons
  7. Paint CalculatorWork out how many gallons of paint you need for a room or a house exterior, minus doors and windows, with coats, primer, quarts or 5-gallon pails and cost.14 × 12 ft room, 2 coats → 2 gallons + 1 quart
  8. Roof Pitch CalculatorConvert rise and run, pitch or angle to roof pitch (x:12), degrees, percent slope and pitch multiplier, get rafter length, and see which roofing the IRC allows.6 in rise per 12 in run → 6:12 = 26.57°
  9. Drywall CalculatorWork out how many 4×8, 4×10 or 4×12 drywall sheets you need for walls and ceilings, plus screws, joint compound, tape and cost, with IRC code checks.14 × 12 ft room, 8 ft walls + ceiling → 19 sheets
  10. Mulch CalculatorHow much mulch do you need? Get cubic yards, cubic feet and bags for beds and tree rings, subtract existing mulch, and compare bulk delivery with bags.20 × 10 ft bed, 3 in → 1.85 yd³
  11. Roofing CalculatorAsphalt shingle roof estimate from size and pitch: squares, bundles, starter, ridge cap, underlayment (incl. wind design), ice barrier, drip edge, nails, cost.40 × 30 ft gable at 6:12 → 45 bundles
Good to know

How the calculators work

Rounded up, never down

Bags, boards, tiles and posts are rounded up to whole units. Where waste applies, you see the allowance and can change it.

Formulas on the page

Each calculator shows its main formulas and the manufacturer data sheets or building-code sections behind them.

Checked against the makers

We compare results with manufacturers' published yields and coverage charts where they exist, and check again whenever a calculator changes.

Results you can share

Your measurements are saved in the link. Bookmark it, print the shopping list or send it to whoever is helping.