Unit Converter
Convert length, weight, volume and temperature units.
How unit conversion works
Each unit is related to a base unit: the meter for length, the kilogram for weight and the liter for volume. To convert, the calculator turns your value into the base unit and then into the unit you want. Temperature uses formulas instead of a single factor:
- °F = °C × 9/5 + 32
- °C = (°F − 32) × 5/9
- K = °C + 273.15
Handy reference values
| Conversion | Value |
|---|---|
| 1 mile | 1.609344 kilometers |
| 1 inch | 2.54 centimeters |
| 1 foot | 0.3048 meters |
| 1 pound | 0.45359237 kilograms |
| 1 US gallon | 3.785411784 liters |
| 1 US cup | 236.5882365 milliliters |
| 0°C / 100°C | 32°F / 212°F |
Looking for a specific conversion such as 5 km to miles? See the list of quick conversions.
Frequently asked questions
Are the gallons US or imperial?
Gallons, quarts, pints and cups here are US customary units. A UK (imperial) gallon is larger, about 4.546 liters.
Why do the same values sometimes differ slightly on other sites?
Different sites round results differently. This calculator uses the exact international definitions of the units and rounds only the displayed answer.
At what temperature are Celsius and Fahrenheit equal?
At −40 degrees, where both scales read the same number.
How do I convert miles to kilometers quickly?
Multiply miles by 1.609344. For a rough mental estimate, multiply by 1.6.