Unit Converter

Length, weight, temperature, volume, and pressure — metric and imperial.

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Quick Answer

Select the measurement category (length, weight, temperature, volume, or pressure), enter your value, and select the unit you are converting from. All equivalent values update instantly. Key conversions: 1 km = 0.621 miles, 1 kg = 2.205 lbs, 0°C = 32°F, 1 US gallon = 3.785 litres.

How to use this unit converter

Select a unit category from the tabs, enter your value, choose the input unit, and the converter shows all equivalent values simultaneously. Covers length, weight, temperature, volume, and pressure.

Metric vs. imperial units

The metric system uses powers of 10, making conversions straightforward. Imperial units have less regular relationships. This converter handles both systems and converts between them.

US vs. UK measurements

Some units differ between the US and UK. A US gallon (3.785 L) is smaller than a UK imperial gallon (4.546 L). This converter uses US imperial units as defaults.

Frequently asked questions

How do you convert Celsius to Fahrenheit?

Multiply Celsius by 9/5, then add 32. For example, 20 degrees C = (20 x 9/5) + 32 = 68 degrees F. To convert the other way: subtract 32, then multiply by 5/9.

How many miles are in a kilometer?

1 kilometer = 0.621371 miles. To convert km to miles, multiply by 0.621371. To convert miles to km, multiply by 1.60934.

How many pounds are in a kilogram?

1 kilogram = 2.20462 pounds. To convert kg to lbs, multiply by 2.20462. To convert lbs to kg, divide by 2.20462.

How do you convert liters to gallons?

1 US gallon = 3.78541 liters. To convert liters to US gallons, divide by 3.78541. Note: US gallons and UK imperial gallons differ. 1 UK gallon = 4.54609 liters.