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Measure once. Buy the right amount.
Calculators for concrete, mulch, gravel, paint, roofing and stairs. Type your measurements, get cubic yards, bags, gallons or bundles, and print the shopping list. Every default comes from a manufacturer data sheet or a building code, linked on the page.
Calculators by project
All 10 calculators →Concrete
Slabs, footings, posts and stepsLandscaping
Mulch, gravel and topsoil by the yard or bagPaint
Walls, ceilings and coatsRoofing
Pitch, squares and bundlesStairs
Risers, treads and stringersMeasuring
Area and volume conversionsHow we source numbers
- 01
From the label, not a forum
Bag yields, paint coverage and shingle bundles come from the manufacturer's own data sheet or product page.
- 02
Codes from the code
Stair limits come from IRC R311.7 and shingle slope limits from IRC R905.2, as reprinted by building departments.
- 03
Math you can check
Each page shows its formula and the arithmetic, so you can redo it with a tape measure and a pencil.
Estimates only. Check local codes and your product's label. More on how we check.