Why are US and UK gallons different?

The US liquid gallon was based on wine measurement (3.785 L); the UK imperial gallon on beer (4.546 L). A UK gallon is 20% larger. US dry gallon is yet another size - 4.405 L.

How many liters in a barrel of oil?

One standard oil barrel = 42 US gallons = 158.987 liters. This is the global pricing benchmark for crude oil.

Which gallon do Canadian gas stations use?

Canada switched to liters for fuel pricing in the 1970s. Prices are per liter, but many older signs still show per-gallon equivalents using the US gallon.

🛢️ Fuel Volume Converter

Gas stations in the US sell gallons, everywhere else sells liters, boat owners use UK gallons. This converter keeps all three straight, plus pints, quarts, and fluid ounces.

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Last updated September 10, 2026 — conversions use exact ISO unit definitions.