What is the difference between US and imperial gallons?
The US gallon is 3.785 litres, while the imperial gallon used in the UK is about 4.546 litres. This converter uses the US gallon, which is the standard in the United States.
Unit Converter
Convert between metric, imperial and US units for length, area, volume, weight, speed and temperature.
Runs in your browser — nothing is uploaded
About the Unit Converter
Recipes, shipping weights, property sizes and fuel economy all mix units from different systems. Converting by hand invites errors, and the conversion factors are easy to forget. A converter that shows every unit in a category at once helps you check the result against a second reading.
Choose the category, enter a value and the starting unit. Each unit in the category is listed with the converted value. Factors use exact international definitions, and US customary units use their official US definitions.
FAQ
Unit Converter — frequently asked
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32, so 20 °C is 68 °F. The converter does this for you and also shows Kelvin.
Why are some results slightly different from common approximations?
Rules of thumb such as one kilometre is about 0.62 miles are rounded. The converter uses exact factors, so its results are more precise.
Can I convert between categories?
No. Length cannot be converted to weight, and area to volume needs a depth. Choose the category that matches the quantity you are measuring.
What about nautical miles and knots?
Both are included in the length and speed categories. A nautical mile is 1,852 metres, and a knot is one nautical mile per hour.
Is my data stored?
No. The conversion runs in your browser and nothing is saved.
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