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Free gallons to liters converter with instant bidirectional conversion. Enter US gallons to get liters, or enter liters to get US gallons. Includes milliliters and quarts output for additional context.
Last updated: April 16, 2026
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Volume Formulas
liters = gallons x 3.785411784 and gallons = liters x 0.2641720524
Gallons to Liters
1 gal = 3.785412 L
Formula: 1 x 3.785411784 = 3.785412 L
Milliliters
3,785.41 ml
US Quarts
4 qt
Quick reference
Formula
gal x 3.785411784
Uses exact conversion factor for accurate liter output.
Formula
L x 0.2641720524
Reverse conversion with exact gallon output.
Outputs
ml and qt
Useful for cooking, fuel, storage, and shipping.
For 5 US gallons, the equivalent volume is 18.9271 liters.
Input
5 gal
Output
18.9271 L
This gallons to liters converter uses internationally recognized conversion constants between US liquid gallons and metric liters. The calculator detects the edited field and applies the matching formula instantly.
L = gal x 3.785411784gal = L x 0.2641720524qt = gal x 4These constants are standard for fuel, cooking, packaging, and liquid storage calculations.
Result: 8 gal equals 30.2833 L
This is also 30,283.29 ml or 32 quarts.
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