Plan your project. Calculate what you need.
Free construction and home-improvement calculators
Calculators for materials, quantities and project planning. Free, no sign-up, and built to work on your phone.
Explore calculatorsMaterial calculators for every building project
BuildKit is a set of building material calculators for homeowners, DIYers and small contractors. Enter your measurements and get the quantity to buy, with a waste allowance already included.
Not sure where to start? Pour a patio with the concrete calculator, plan the base with the gravel calculator and paver calculator, or work out how much paint you need with the paint calculator. Doing floors? Try the flooring and tile calculators, or plan a re-roof with the roofing calculator. Need a quick volume? The cubic yard calculator converts square feet and depth, and the topsoil, rebar, drywall and brick and block calculators cover the rest. Outside, the fence and mulch calculators cover the rest.
How it works
- 1
Enter your measurements
Use imperial or metric units.
- 2
Get your quantities
Volume, weight, boxes or pieces, with waste added.
- 3
Copy, download or print
Take the numbers to the supplier.
Popular calculators
Concrete Calculator
Cubic yards, metres and bags for slabs, footings, walls, stairs and columns.
Gravel Calculator
Volume and weight of gravel for driveways, paths and bases.
Paint Calculator
Gallons or litres for walls and ceilings, after doors and windows.
Fence Calculator
Panels and posts for open runs or closed loops, with gates.
Browse by category
Materials
Bulk materials for pours and bases.
Surfaces
Coverings for walls and floors.
Outdoor
Gardens, patios and boundaries.
Project planning
Every calculator is built to help you buy the right amount, not just get a number.
Imperial and metric
Switch units at any time.
Waste built in
Overage is added for you, and you can change it.
Shopping-ready
Copy, download or print your result.
Transparent maths
Every formula and assumption is shown.