Convert US Gallons (gal) to Liters (L)
Category: Volume
1 gal = 3.785412 l
High-precision rounding: 6 decimals
How to convert gallons to liters
We convert by pivoting through the SI base unit for Volume and applying exact factors where applicable.
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Examples
Linear unit conversions use standardized factors; many are exact by definition (e.g., 1 in = 25.4 mm, 1 ft = 0.3048 m).
Common mistakes
- Mixing US gallons (3.785 L) with Imperial gallons (4.546 L).
- Assuming kitchen ‘cup’ equals the same volume in every country.
About Volume
Volume measures the space a substance occupies. SI uses cubic meters and liters; customary units like gallons, quarts, and pints persist in recipes, fuel, and containers. Accurate volume work often requires temperature and density considerations (e.g., for fuels).
About US gallon (gal)
US gallon (gal)
Exactly 3.785411784 L. Used for fuel, containers, and recipes in the US. Beware of imperial gallon differences.
History: US defined the gallon separately from the British imperial revision; modern value is exact.
About Liter (L)
Liter (L)
Equals 1 dm³; convenient for beverages, fuel, and appliance capacity. Interchangeable with 1,000 cm³. Widely recognized symbol ‘L’.
History: Originated in early metric definitions. Adoption accelerated with packaging standardization and consumer labeling.