FORMULA
How to convert
L = gal × 3.785411784Example: 10 gal = 37.85411784 L.
GAL → L
Us Gallons to Liters
Convert US gallons to liters with an exact, deterministic calculation.
LIVE CONVERSIONDECIMAL ENGINE EXACT_
1 gal = 3.785411784 L
MULTI-CONVERT
QUICK ANSWER
1 US gallon
3.785411784 L
REFERENCE TABLE
US gallon to Liter
| US gallons | liters |
|---|---|
| 1 gal | 3.78541178 L |
| 5 gal | 18.92705892 L |
| 10 gal | 37.85411784 L |
| 25 gal | 94.6352946 L |
| 50 gal | 189.2705892 L |
| 100 gal | 378.5411784 L |
ABOUT THIS CONVERSION
Convert US gallons to liters
This route converts US liquid gallons to liters using the exact definition 1 US gal = 3.785411784 L. It is appropriate for US fuel economy, tank capacity, and liquid packaging, but not Imperial gallons.
Real-world example
A 2 US gal container holds 7.57082357 L. Usable tank capacity can differ from its nominal label, which is a product specification issue rather than a conversion error.
Rounding and precision
For packaging, round to the labeled container precision. Laboratory and dosing work must follow calibrated equipment and required tolerances. Keep full precision during the conversion and round only after the final unit is chosen.
Regional context
A US liquid gallon is not an Imperial gallon, and their fluid ounces differ. Every customary entry here is labeled as US where ambiguity matters; the plain fluid-ounce entry uses the US liquid definition.
Common mistake
Do not use 4.54609 unless the source explicitly says Imperial or UK gallon. Mixing gallon systems causes an error of about twenty percent.
Editorial method
Definitions and sources are listed below. Calculations retain more precision than the default display and round only for presentation.
USEFUL ANSWERS
gal to L FAQs
How many liters are in five US gallons?
Five US liquid gallons equal exactly 18.92705892 liters.
Are US fuel gallons liquid gallons?
Yes. Retail motor fuel in the United States is measured in US liquid gallons.
How do I convert US gallons to liters?
Enter the gal value in the calculator. It applies the stored factor and offset definitions and returns the equivalent in L; the formula and common-value table are shown on this page.
Is the gal to L conversion exact?
Defined measurement relationships are calculated with decimal arithmetic from stored standards. The displayed answer may be rounded for readability. Currency results instead depend on the dated reference rate shown.
FROM UNIT
US gallon
The US liquid gallon is exactly 231 cubic inches, equal to 3.785411784 liters. It measures three-dimensional capacity; customary liquid units use the labeled US definition.
NIST Guide to the SI, SP 811 ↗Definition verified 14 August 2026TO UNIT
Liter
The liter (L) is a non-SI unit accepted for use with SI and equals exactly one cubic decimeter. It measures three-dimensional capacity; customary liquid units use the labeled US definition.
NIST Guide to the SI, SP 811 ↗Definition verified 14 August 2026Content reviewed by Akhil Saroop · 16 August 2026 · Report an error on this page