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Unit Converter
Convert length, weight, temperature and volume in one place — miles to kilometers, pounds to kilograms, Fahrenheit to Celsius, gallons to liters, and more. Free, with no sign-up.
Example filled in: 5 miles = 8.05 km. Change any number below to run your own conversion.
Your conversions
Results appear here as you type.
How to use the unit converter
- Type a number in any of the four sections — length, weight, temperature or volume.
- Pick the unit you are starting from and the unit you want.
- The answer updates as you type, in the panel on the right. All four sections work at once, so you can convert a distance and a weight on the same visit.
Worked examples — checked against the converter
Length: 5 miles is 8.05 kilometers (5 × 1.609344 = 8.04672, rounded to two places). Weight: 10 pounds is 4.54 kilograms (10 × 0.45359237 = 4.5359237). Temperature: 68 degrees Fahrenheit is 20 degrees Celsius ((68 − 32) × 5 ÷ 9 = 20). Volume: 1 US gallon is 3.79 liters (1 × 3.785411784 = 3.785411784). Try each one above and you will get the same answer.
Frequently asked questions
How many kilometers are in a mile?
One mile is 1.609344 kilometers, exactly. So 5 miles is 8.05 kilometers, and 10 miles is 16.09 kilometers.
How do I convert pounds to kg?
Multiply the pounds by 0.45359237. 10 pounds is 4.54 kilograms, and 150 pounds is 68.04 kilograms.
What is 68 degrees Fahrenheit in Celsius?
68 °F is 20 °C. The rule is: take away 32, then multiply by 5 and divide by 9.
How many liters are in a gallon?
One US gallon is 3.785411784 liters. A UK gallon is bigger — 4.54609 liters — so this converter uses the US gallon, the one used in the United States.
Why do the answers show two decimal places?
Most everyday conversions only need two. The maths behind them uses the full exact figures — for example, 1 inch is exactly 2.54 centimeters — and the display is rounded for reading.
Sources and method. NIST exact unit definitions: 1 inch = 2.54 cm, 1 pound = 0.45359237 kg, 1 US gallon = 3.785411784 liters. Worked examples checked in Node: 5 mi = 8.04672 km, 10 lb = 4.5359237 kg, 68 °F = 20 °C, 1 gal = 3.785411784 L.