Home improvement material calculators
Work out how much material to buy before you go to the store. Every calculator shows its math, step by step.
Tile calculator
Work out how many tiles and boxes you need for a floor or wall, including waste and grout joints.
Concrete slab calculator
Work out how much concrete a slab needs in cubic yards or cubic meters, how many bags to buy, and an optional cost estimate.
How we calculate
- Each calculator shows its formula and every step of the math, using your numbers.
- Things you buy whole, such as tiles, boxes and bags, are always rounded up.
- Waste allowances and bag yields are shown as assumptions you can change.
- Every formula is checked by automated tests against worked examples.
- What you type stays in your browser. It is never sent to us.
Results are estimates, not quotes. Check quantities with your supplier, and ask a professional for structural work. More about how the calculators work.