Skip to main content

Gallons to Liters (gal to L)

A US gallon is exactly 3.785411784 liters. The UK (imperial) gallon is larger at 4.54609 liters — about 20% more — so check which gallon you have.

Liters
3.78541

Formula

liters = US gallons × 3.785411784

Example: 5 US gallons = 18.9271 liters.

Gallons to Liters chart

US gallonsliters
0.51.89271
13.78541
27.57082
518.9271
1037.8541
1245.4249
1556.7812
2075.7082
2594.6353
30113.562
40151.416
50189.271
55208.198
75283.906
100378.541

Good to know

Fuel economy and tank sizes are where the two gallons get mixed up: a 15-gallon US tank holds 56.8 L; a 15-gallon UK tank would hold 68.2 L. Miles per gallon figures differ for the same reason.

Aquariums: a 20-gallon tank is 75.7 L and a 55-gallon tank is 208 L of gross volume, before gravel and decor.

Frequently asked questions

How many liters in a gallon?

3.785 L in a US gallon; 4.546 L in a UK (imperial) gallon.

How many liters is 5 gallons?

5 US gallons is 18.93 L.

Is a UK gallon bigger than a US gallon?

Yes, by about 20%: 4.546 L vs 3.785 L.

More volume & liquid conversions