Convert US gallons to Liters
1 US gallon is 3.79 L. One US gallon is exactly 3.785411784 liters.
One US gallon is 3.7854118 liters. To convert US gallons to liters, multiply by 3.7854118; to go the other way, divide by 3.7854118 or multiply by 0.26417205. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Handbook 130. Exactly 231 cubic inches.
Factor checked against the defining standard · How we check
- US gallons × 3.7854118
1 * 3.78541183.785 L
1 US gallon in every volume unit
| Unit | Value | Exact factor |
|---|---|---|
| US teaspoons | 768 tsp | × 768 |
| US tablespoons | 256 tbsp | × 256 |
| US fluid ounces | 128 fl oz | × 128 |
| US cups | 16 cup | × 16 |
| US pints | 8 pt | × 8 |
| US quarts | 4 qt | × 4 |
| US gallons (as entered) | 1 gal | — |
| milliliters | 3,785.411784 ml | × 3,785.411784 |
| liters | 3.785411784 L | × 3.785411784 |
| imperial gallons | 0.8326741846 gal (UK) | × 0.832674184629 |
| imperial quarts | 3.330696739 qt (UK) | × 3.33069673852 |
| imperial pints | 6.661393477 pt (UK) | × 6.66139347703 |
| imperial fluid ounces | 133.2278695 fl oz (UK) | × 133.227869541 |
| imperial gills | 26.64557391 gi (UK) | × 26.6455739081 |
| cubic millimetres | 3,785,411.784 mm³ | × 3,785,411.784 |
| cubic centimetres | 3,785.411784 cm³ | × 3,785.411784 |
| cubic inches | 231 in³ | × 231 |
| cubic feet | 0.1336805556 ft³ | × 0.133680555556 |
| cubic yards | 0.004951131687 yd³ | × 0.00495113168724 |
| cubic metres | 0.003785411784 m³ | × 0.003785411784 |
Factors are entered by hand from NIST Handbook 130 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
The same converter answers this pair however it is written: US gallons to litres is the British spelling of the same units — the metre and the litre are spelled that way outside the United States and the quantity does not change.
How do you convert US gallons to liters? The converter and the working
- 1.Take the measurement in US gallons.
- 2.Multiply by 3.7854118 — that is how many liters fit in one US gallon.
- 3.To go back the other way, divide by 3.7854118, or multiply by 0.26417205.
Worked example: 25 US gallons to liters
- Formula
- gal × 3.7854118 = L
- Arithmetic
- 25 × 3.7854118 = 94.64 L
- Answer
- 25 gal = 94.64 L
The factor is rounded for display; the figure above is computed from the full value.
US gallons to liters conversion table
| US gallons | Liters |
|---|---|
| 1 gal | 3.79 L |
| 2 gal | 7.57 L |
| 3 gal | 11.36 L |
| 4 gal | 15.14 L |
| 5 gal | 18.93 L |
| 6 gal | 22.71 L |
| 7 gal | 26.5 L |
| 8 gal | 30.28 L |
| 9 gal | 34.07 L |
| 10 gal | 37.85 L |
| 12 gal | 45.42 L |
| 15 gal | 56.78 L |
| 20 gal | 75.71 L |
| 25 gal | 94.64 L |
| 50 gal | 189.27 L |
| 100 gal | 378.54 L |
| 200 gal | 757.08 L |
| 300 gal | 1,135.62 L |
| 500 gal | 1,892.71 L |
| 1000 gal | 3,785.41 L |
| 2000 gal | 7,570.82 L |
| 5000 gal | 18,927.06 L |
| 10000 gal | 37,854.12 L |
A US gallon and a UK gallon are not the same gallon
The US gallon is 3.785411784 liters; the imperial gallon, still used in the UK for fuel economy and in a few Commonwealth countries, is 4.54609 liters — twenty per cent larger. Every figure on this page is the US gallon. It is also why British and American miles-per-gallon numbers cannot be compared: 40 mpg in the UK is about 33 mpg in the US, on the same car.
NIST Handbook 44, Appendix C — general tables of units of measurement
What is a US gallon?
Exactly 231 cubic inches. The imperial gallon is 4.546 liters, so US and UK fuel economy figures are not comparable.
What is a liter?
One cubic decimeter. A liter of water weighs almost exactly one kilogram, which is how the unit was designed.
How many liters are in a US gallon?
One US gallon is 3.7854118 liters. Going the other way, one liter is 0.26417205 US gallons. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every volume unit here
The whole group — 20 units with their symbols and the size of each one in liters — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a US gallon.
Cite this page
- APA
- Rule Calculator. (2026). Convert US gallons to liters. Rule Calculator. https://rulecalculators.com/convert/gallon-to-liter
- MLA
- "Convert US gallons to liters." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/gallon-to-liter.
- Chicago
- Rule Calculator. "Convert US gallons to liters." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/gallon-to-liter.
The date is when the figures on this page were last checked against their source, not the day you opened it. Add your own access date if your style needs one.
Questions people actually ask
- How many liters are in a US gallon?
- 3.7854118. One cubic decimeter. A liter of water weighs almost exactly one kilogram, which is how the unit was designed.
- How do I convert liters back to US gallons?
- Divide by 3.7854118, or multiply by 0.26417205 — they are the same operation.
The values people look up
Each one is this page with the value filled in, and each answers in its own title.
Other volume conversions
Liters to US gallons — the same conversion the other way.