How many liters are in a US gallon?

1 gal = 3.7854 L. To convert any amount, multiply by 3.7854.

How do you convert US gallons to liters?

Multiply the number of US gallons by 3.7854 to get liters. The formula is shown in the "How it's calculated" section above.

Where does the conversion factor come from?

It's a published international standard. Most are defined exactly by international agreement (e.g. 1 inch = 25.4 mm exactly, 1 lb = 0.45359237 kg exactly). Source citations are listed under the formula above.

Unit converter — Volume

US gallons to liters converter

Convert US gallons (gal) to liters (L). Source-cited conversion factor, exact to the displayed precision.

Results are mathematically exact for the displayed precision. How we calculate.

How it's calculated

Convert US gallons to liters— the formula

US gallons convert to liters by multiplying by the published conversion factor. The factor below is exact to the precision shown, sourced from the citation under the formula.

L = gal × 3.7854

gal = L × 0.264172

Metric volumes per BIPM SI definitions. US customary volumes per NIST Handbook 44: 1 US gal = 3.785411784 L exactly; 1 fl oz = 1/128 US gal.

Questions

Frequently asked questions

How many liters are in a US gallon?
1 gal = 3.7854 L. To convert any amount, multiply by 3.7854.
How do you convert US gallons to liters?
Multiply the number of US gallons by 3.7854 to get liters. The formula is shown in the "How it's calculated" section above.
Where does the conversion factor come from?
It's a published international standard. Most are defined exactly by international agreement (e.g. 1 inch = 25.4 mm exactly, 1 lb = 0.45359237 kg exactly). Source citations are listed under the formula above.