Know exactly how much to buy.
Free, accurate calculators for home and DIY projects. Switch between US units (feet, pounds, gallons) and UK metric units (metres, kilograms, litres) in one click, and see the formula behind every answer.
- US & UK units
- Rounded to bags, boxes & tins
- Formulas explained
- No sign-up
Home & DIY calculators
- Concrete Calculator Volume and bags of mix for slabs, footings and post holes.
- Paint Calculator Gallons or litres of paint for walls and ceilings.
- Square Footage Calculator Area of rooms and plots in ft², m², yd² and acres.
- Mulch Calculator Mulch, bark, compost or topsoil for beds and borders.
- Gravel Calculator Gravel, stone, sand and sub-base by volume and weight.
- Flooring Calculator Boxes of laminate, vinyl or wood flooring, with waste.
- Tile Calculator Floor and wall tiles, including grout joints and waste.
- Drywall & Plasterboard Calculator Sheets of drywall or plasterboard for walls and ceilings.
- Roofing Calculator Roof area from pitch, shingle bundles or roof tiles.
- Fence Calculator Posts, panels or pickets, rails and post concrete.
No calculators match that search yet. Suggest one.
Why CalcBrook?
Most online calculators assume you live in the US. CalcBrook is built for both sides of the Atlantic: every tool works in feet and inches or metres and millimetres, uses the bag, tin and sheet sizes you will actually find in American and British stores, and rounds up to whole packs so you can go straight to the checkout.
Each calculator explains its formula with worked examples, so you can see how the answer was reached — and check it yourself before you spend money on materials.