US Gallons to Liters Converter
Convert US gallons to liters for American liquid measurement.
How It Works
Formula: US gal to L = value × 3.785411784
Example: 1 US gal = 3.7854 L
Note: 1 US gallon equals 3.785411784 liters using the US customary liquid gallon standard, based on 231 cubic inches.
Common Uses
Rounding Rule
Rounded to 6 decimal places
Error Margin
±0.00001 L
Precision Guidance
For everyday use, 2-3 decimal places is sufficient. For industrial or scientific use, maintain full precision.
Common Mistakes
Do not confuse US gallon with imperial gallon. This converter uses the US customary liquid gallon (3.785411784 L), not the imperial gallon (4.54609 L).
Frequently Asked Questions
What is 1 US gallon in liters?
1 US gallon equals exactly 3.785411784 liters using the US customary liquid gallon standard.
Is US gallon different from imperial gallon?
Yes, the US gallon (3.785 L) is smaller than the British imperial gallon (4.546 L). This converter uses the US customary gallon only.
Why are there different gallon standards?
The US and UK historically used different gallon definitions. The US liquid gallon is based on the wine gallon (231 cubic inches), while the imperial gallon is larger.
How to use this converter for fuel consumption?
For MPG to L/100km conversion or liquid measurements, this converter provides the accurate US gallon to liter conversion needed for American fuel economy calculations.
Deep Dive Guide
US Gallons to Liters Exact Conversion for American Liquid Measurement
Convert US customary gallons to liters accurately for American liquid storage, fuel measurement and daily household liquid calculation.
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Last Updated 2026 | This converter was reviewed for accuracy