Understand the relationship
Visual explanation
The formula reverses the gallons-to-liters conversion. Because 1 US gallon equals exactly 3.785411784 liters, dividing a liter amount by that factor returns gallons.
Most liter amounts do not become tidy gallon fractions. Keep the unrounded value during your calculation, then round the final answer to the precision your task needs.
Calculate it
The formula
US gallons = liters ÷ 3.785411784Instant converter
Convert while you learn
1 liter equals
US gallons
Calculated from the canonical unit dataset.
1 × 1000 mL ÷ 3785.411784 mL
Follow the reasoning
Worked examples
Convert 5 liters to US gallons.
5 ÷ 3.785411784 = 1.320860262…5 L ≈ 1.32086 US gal
Convert 20 liters to US gallons.
20 ÷ 3.785411784 = 5.283441047…20 L ≈ 5.28344 US gal
Convert 3.785411784 liters.
3.785411784 ÷ 3.785411784 = 13.785411784 L = 1 US gal
Quick lookup
liter to US gallons chart
| liters | US gallons |
|---|---|
| 1 | 0.26417205236 |
| 2 | 0.52834410472 |
| 3 | 0.79251615707 |
| 3.785411784 | 1 |
| 5 | 1.3208602618 |
| 10 | 2.6417205236 |
| 20 | 5.2834410472 |
Values are generated from the same canonical constants used by the converter. Decimal display may be rounded.
Common mistake
Check the unit and direction
Multiplying liters by 3.785 makes the value larger and goes in the wrong direction. A liter is smaller than a US gallon, so divide to get fewer gallons.
Remember it
A one-liter bottle is about one quarter of a US gallon; four liters is just over one US gallon.
Quick practice
Convert 15 liters to US gallons.
About 3.96258 US gallons.
Accuracy note: Core U.S. liquid relationships and the 231-cubic-inch gallon were checked against NIST Handbook 44 (2026), Appendix C. SI definitions were checked against NIST SI Units—Volume. Imperial values were checked against the UK Weights and Measures Act 1985. Values were last checked on . Review the source list.