Convert gallons to litres (and back) — US or Imperial gallons, with the full volume family.
Advanced options
converted value
| 1 US gallon | 3.785 l |
| 5 US gallons | 18.927 l |
| 10 US gallons | 37.854 l |
| 1 Imperial gallon | 4.546 l |
| 1 litre | 0.264 US gal |
| 20 US gallons | 75.708 l |
How to use this tool
Type any amount (fractions and decimals allowed).
Choose the From and To units, or tap Swap to reverse the conversion.
The result, the per-unit rate and the full unit family are shown together, live as you type.
The reference table covers the values people look up most, so you can sanity-check at a glance.
Formula & worked example
1 US gallon = 3.785 litres. A 10-US-gallon tank holds 37.85 litres; the same 10 Imperial gallons would be 45.46 litres.
Limitations — read this before you rely on it
Always confirm US vs Imperial: fuel economy, tank sizes and recipes differ by up to 20% between the two gallons.
Frequently asked questions
3.785 litres in a US gallon; 4.546 litres in an Imperial gallon.
1 US gallon = 3.785 l; 1 UK gallon = 4.546 l.
0.264 US gallons (or 0.220 Imperial gallons) per litre.
Yes — one US gallon is about 3.79 litres.
Multiply US gallons by 3.78541, or Imperial gallons by 4.54609.