Free Unit Converter
US customary and metric units, converted instantly.
How to use the Unit Converter
- Choose a category: length, weight, volume, temperature, speed, or area.
- Type the amount and pick the From and To units.
- The conversion updates as you type — use Swap to reverse it.
Good to know
- Volume units are US liquid measures (a US gallon is 3.785 liters — an imperial gallon is larger).
- Results are rounded to 7 significant digits, plenty for everyday use.
Frequently asked questions
How many kilometers is a mile?
Exactly 1.609344 km. Enter 1 Miles to Kilometers above to see it.
How do I convert Fahrenheit to Celsius?
Choose Temperature, From Fahrenheit, To Celsius — or remember the formula: (°F − 32) × 5/9.