Unit Converters

Fast, precise conversions between metric, US and imperial units, with the exact conversion factors shown.

Liter to Gallon Converter

Liters to US and imperial gallons, and back, with a quick table.

Knots to MPH

Knots to mph, km/h and m/s, with Beaufort wind force.

Gas Mark to Celsius

UK gas marks to C, fan and F, and any oven temperature back to gas mark.

Bar to PSI

Bar to psi, kPa and atm, with a tire pressure chart.

Feet and Inches Calculator

Add and subtract feet, inches and fractions, then convert to cm and m.

Kg to Lbs

Kilograms to pounds and ounces, stone, and back again.

Celsius to Fahrenheit

Celsius to Fahrenheit and back, with Kelvin and a quick reference table.

Exact conversion factors

Every converter uses the official definition of each unit, such as 1 US gallon = 3.785411784 liters, and shows the factor so you can check the result.