Convert litre to US gallon
1 litre = 0.2641721 US gallons. Enter any value below for an exact conversion.
1 L =
0.2641721 gal
US gallons
Need the reverse? Convert US gallon to litre →
Formula
1 litre = 0.2641721 US gallons US gallon = litres × 0.2641721 litre = US gallons × 3.785412
litre to US gallon conversion table
About converting litres to US gallons
Litres to US gallons matters for fuel economy, vehicle tank sizes, and cooking when comparing metric and US measures. One US gallon is about 3.785 litres — note the US gallon is smaller than the UK (imperial) gallon.
Method & sources
Conversions use exact legal definitions rather than rounded approximations: 1 inch = 2.54 cm and 1 pound = 0.45359237 kg (fixed by the 1959 international yard and pound agreement), 1 mile = 1.609344 km, and 1 US liquid gallon = 3.785411784 litres. Temperatures convert with °F = °C × 9⁄5 + 32 and K = °C + 273.15. Results are rounded only for display.
- NIST Special Publication 811 — Guide for the Use of the SI
- NIST Handbook 44, Appendix C — General Tables of Units of Measurement
Page last updated: October 1, 2026
Frequently asked questions
How many US gallons are in a litre?
One litre equals 0.2641721 US gallons. So 10 litres is 2.641721 US gallons. Use the converter above for any value.
What is the formula to convert litres to US gallons?
1 litre = 0.2641721 US gallons US gallon = litres × 0.2641721 litre = US gallons × 3.785412
Is the litre-to-US gallon conversion exact?
Yes. The conversion factor between litres and US gallons is defined exactly, so results are precise — only rounded for display.
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