Formula guide
Common Conversion Formulas
Most non-temperature unit conversions multiply by a fixed factor. Temperature and fuel economy often need formulas because their scales or relationships are not purely linear.
Length examples
1 inch = 2.54 centimeters. 1 foot = 0.3048 meters. 1 mile = 1.609344 kilometers.
Weight examples
1 pound = 0.45359237 kilograms. 1 ounce = 28.349523125 grams. 1 kilogram = 2.2046226218 pounds.
Temperature examples
Fahrenheit = Celsius x 9/5 + 32. Celsius = (Fahrenheit - 32) x 5/9. Kelvin = Celsius + 273.15.
Pressure and speed examples
1 psi = 6.894757293 kilopascals. 1 mile per hour = 1.609344 kilometers per hour.
Fuel economy examples
US mpg to L/100 km uses a reciprocal relationship: L/100 km = 235.214583 / mpg.