Measurement & construction calculators
Conversions based on the exact international definitions of the inch, foot and mile, plus quantity estimates for site work in metric or imperial units.
- Length ConverterSince 1959 the inch, foot, yard and mile have been defined exactly in metres, so conversions between metric and imperial lengths are exact, not approximations.
- Temperature ConverterCelsius and Kelvin use the same size of degree but a different zero; Fahrenheit uses smaller degrees, 1.8 to every Celsius degree, and puts water’s freezing point at 32.
- Concrete CalculatorConcrete is ordered by volume. Multiply length × width × thickness for a slab, or π × radius² × height for a round column, then add a few percent for waste and uneven ground.