US Gallons to Liters
Convert US gallons to liters.
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Example
5 US gal × 3.78541 = 18.93 L.
How it works
A US gallon is a standard unit of volume used in the United States, and a liter is the metric unit commonly used in science and many countries worldwide. This conversion works because 1 US gallon has been defined as exactly 3.78541 liters, so you multiply the number of gallons by 3.78541 to get the equivalent volume in liters.
When to use it
Use this formula when converting fuel amounts, recipe volumes, lab measurements, or tank capacities from US customary units into metric units. It is especially useful when comparing measurements across countries or using scientific equipment marked in liters.
Worked example, step by step
Convert 12 US gallons to liters. L = gal × 3.78541 L = 12 × 3.78541 L = 45.42492 So, 12 US gal = 45.42 L (rounded to 2 decimal places).
Common mistakes to avoid
- Using the wrong gallon type, such as a UK/Imperial gallon instead of a US gallon
- Dividing by 3.78541 instead of multiplying
- Rounding too early and losing accuracy in the final result
Did You Know?
A US gallon is defined as exactly 3.785411784 liters.
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