Calculator category

Home & Construction calculators

Estimate room measurements and common project materials before buying or building.

6 working calculators

Clear formulas · Useful comparisons · No sign-up

Area and Perimeter Calculator

Calculate area and perimeter for rectangles, squares and circles, or area for a triangle.

Estimate litres of paint from surface area, coverage per litre and the number of coats.

Estimate tile quantity from total surface area, tile dimensions and a waste allowance.

Estimate concrete volume for one or more rectangular slabs, including an adjustable waste allowance.

Estimate room air-conditioner cooling capacity from floor area, occupancy, sun exposure and room use.

Calculate total floor area for repeated rectangular sections and convert between square metres and square feet.