Calculators for construction
Free, instantly usable calculators for construction — for site managers, planners, estimators and installers.
Concrete volume calculator
Work out how many m³ of concrete you need for a slab, footing, strip or column — including bags and a waste allowance. Free and instant.
Concrete volume calculator →
Insulation value (R) calculator
Calculate the thermal resistance R and U-value of a build-up from layer thickness and lambda (λ). For wall, roof and floor.
Insulation value (R) calculator →
Brickwork: bricks per m²
Calculate the number of bricks or blocks per m² and for your whole wall — by brick format, including waste.
Brickwork: bricks per m² →
Tile calculator (m² & pieces)
Work out how many tiles you need from area, tile size, joint width and cutting waste.
Tile calculator (m² & pieces) →
Roof pitch calculator
Convert roof pitch between degrees, percent and ratio — and get the rafter length from run and rise.
Roof pitch calculator →
Hourly rate calculator (construction)
Calculate a realistic construction hourly rate from target income, billable hours, business costs and margin.
Hourly rate calculator (construction) →
Building material densities
Density of concrete, brick, timber, sand, steel, insulation and more — in kg/m³ and g/cm³.
Building material densities →