Housing and Building Calculators: Concrete, Roofing, Tiles and Room Size
Ordering too little material delays a project and ordering too much wastes money. These calculators estimate quantities for concrete, roofing and tiling from your measurements so you can plan purchases. Add a margin for waste and always confirm with your contractor.
6 free housing / building calculators
Concrete Calculator
Concrete volume needed for a slab or footing, plus bag counts.
Open calculator →BTU Calculator
Rough BTU/hr sizing for a room air conditioner or heater.
Open calculator →Square Footage Calculator
Total square footage across one or more rectangular rooms.
Open calculator →Stair Calculator
Number of steps, riser height, run and stringer length for a staircase.
Open calculator →Roofing Calculator
Roof surface area and roofing squares needed, from footprint and pitch.
Open calculator →Tile Calculator
How many tiles you'll need for a room, with a waste allowance.
Open calculator →Frequently asked questions
Should I add extra for waste?
Yes. Most builders add 5–10% to cover cuts, breakage and spillage; check the recommendation for your material.