What is the difference between the US gallon and the UK (Imperial) gallon?

The US gallon is smaller than the UK (Imperial) gallon; the US gallon equals approximately 3.785 liters, while the UK gallon equals about 4.546 liters.

Which countries primarily use the US gallon?

The US gallon is primarily used in the United States, its territories, and some Caribbean countries such as the Bahamas, the Cayman Islands, and Liberia.

Why do some countries use the US gallon instead of the metric system?

Certain countries continue to use the US gallon due to historical ties, established standards in fuel and liquid measurement, and slower adoption of the metric system.

What Countries Use the US Gallon for Liquid Measurements?

Discover which countries use the US gallon for measuring fuel and liquids, including the US, its territories, and select Caribbean nations.

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Oct 16, 2026

Countries that use the US gallon include the United States, its territories, and a few countries in the Caribbean, such as the Bahamas, the Cayman Islands, and Liberia. In these countries, the US gallon is commonly used for fuel volumes and other liquid measurements. It's important to note the US gallon is different from the UK (Imperial) gallon, which is used in some other countries.

FAQs & Answers

What is the difference between the US gallon and the UK (Imperial) gallon? The US gallon is smaller than the UK (Imperial) gallon; the US gallon equals approximately 3.785 liters, while the UK gallon equals about 4.546 liters.
Which countries primarily use the US gallon? The US gallon is primarily used in the United States, its territories, and some Caribbean countries such as the Bahamas, the Cayman Islands, and Liberia.
Why do some countries use the US gallon instead of the metric system? Certain countries continue to use the US gallon due to historical ties, established standards in fuel and liquid measurement, and slower adoption of the metric system.

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