This unit converter switches between metric and imperial units for length, weight, temperature and volume. Convert centimetres to inches, kilograms to pounds, Celsius to Fahrenheit, litres to gallons and much more.
Pick a category, enter a value, then choose the units to convert from and to. The result updates instantly with up to six decimals of precision.
1 inch = 2.54 cm, 1 kg = 2.2046 lb, 100 °C = 212 °F, 1 US gallon = 3.785 litres, 1 mile = 1.609 km.
Metric scales by tens — 10 mm to a centimetre, 1000 metres to a kilometre — so conversions within the system are easy. Imperial units (inch, foot, mile, pound, gallon) come from older standards, so crossing between systems needs a fixed factor, which is exactly what this converter applies.
Recipes and road signs are the everyday reasons to convert. A US cup is about 237 ml, an oven at 180 °C is 356 °F, and 100 km/h is roughly 62 mph.
Some imperial units differ by country. A US gallon (3.785 L) is smaller than a UK gallon (4.546 L), and the pints differ too. The volume units here use US measures, so check which standard a recipe assumes.