Unit converters
Convert between metric and imperial units for length, mass, temperature, area, volume, speed, pressure, energy, fuel economy and digital storage.
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin and Rankine instantly. Shows the formula used and a…
Length Converter
Convert lengths between metres, feet, inches, miles, kilometres, yards and more. Instant results with…
Weight Converter
Convert weight and mass between kilograms, pounds, stones, ounces, grams and tonnes. Precise results…
Data Storage Converter
Convert between bits, bytes, KB, MB, GB, TB, PB and their binary equivalents (KiB, MiB, GiB). Clarifies…
Speed Converter
Convert speed between km/h, mph, m/s, ft/s, knots and Mach. Useful for travel, physics and aviation…
Cooking Measurement Converter
Convert between cups, tablespoons, teaspoons, millilitres, fluid ounces and litres. Uses US customary…
Volume Converter
Convert volumes between litres, millilitres, gallons (US/UK), cubic metres, cubic feet and more…
Area Converter
Convert area between square metres, square feet, acres, hectares, square kilometres and square miles…
Time Unit Converter
Convert time between seconds, minutes, hours, days, weeks, months and years. Useful for project…
Fuel Economy Converter
Convert fuel economy between miles per gallon (US/UK), litres per 100 km and km per litre. Compare…
Pressure Converter
Convert pressure between pascals, bar, psi, atmospheres, mmHg and torr. Covers engineering, weather and…
Energy Converter
Convert energy between joules, kilojoules, kilowatt-hours, calories, kilocalories, BTU and…
Power Converter
Convert power between watts, kilowatts, megawatts, horsepower (mechanical & metric), BTU/h and…
Angle Converter
Convert angles between degrees, radians, gradians, turns and arc-minutes/seconds. Essential for maths…
About Unit converters tools
Conversion errors are expensive: a misread fuel figure or the wrong shoe size costs money, and in engineering it costs more. Our converters use exact factors where they exist (an inch is exactly 25.4 mm) and clearly named standards where several definitions compete — US versus imperial gallons, short versus metric tons, nautical versus statute miles.
Each converter shows a full comparison table so you can sanity-check the result at a glance.