Tools
Home improvement calculators
Work out how much material your project needs before you shop or call a contractor. Each calculator shows its assumptions, lets you change them and works in metric or imperial.
Choose a calculator
- Roofing calculatorRoof area from the footprint and pitch, then squares and shingle bundles.Open the calculator
- Paint calculatorLitres and 3.78 L cans for walls and ceilings, minus doors and windows.Open the calculator
- Flooring calculatorFloor area plus waste, then the number of boxes to buy.Open the calculator
- Drywall calculatorSheets of 4 × 8, 4 × 10 and 4 × 12 for walls and ceiling.Open the calculator
- Concrete calculatorSlabs, footings and post holes in m³ or yd³, plus premixed bags.Open the calculator
- Tile calculatorTile area plus waste, then the number of tiles and boxes.Open the calculator
- Mulch and topsoil calculatorVolume of mulch or topsoil in m³, yd³ or bags.Open the calculator
How our calculators work
- Quantities only: area, volume, sheets, boxes, bags and litres. We don’t estimate prices.
- Every default, like paint coverage or a waste allowance, is shown and can be changed.
- Switch between metric and imperial at any time. The numbers you entered are converted.
- Results update as you type and can be printed for the store or your contractor.
Planning a bigger project?
Our guides explain how to plan, hire for and budget common home projects.
Browse the guidesRather have a pro handle it?
Describe your project once and hear back from local pros. It’s free and there’s no obligation.