Unit converters
Convert length, area, volume, mass, speed, angles, torque and energy with explicit unit definitions and examples.
Length converter
Convert length units including millimetres, inches, feet and miles.
Area converter
Convert square units, hectares and acres using squared length factors.
Volume converter
Convert litres, cubic units and explicitly labelled US or UK gallons.
Mass converter
Convert metric mass, pounds, ounces and stones with defined unit factors.
Speed converter
Convert speed between metres per second, kilometres per hour, mph and knots.
Angle converter
Convert degrees, radians, turns and gradians, with signed DMS input and output.
Torque converter
Convert torque between newton metres, pound-force feet and related units.
Energy converter
Convert joules, watt-hours and thermochemical calories with visible equivalences.
Linear inches calculator
Add length, width and height to calculate combined dimensions in inches and centimetres.