How many liters are in a gallon?

A US gallon is about 3.785 liters. An imperial (UK) gallon is about 4.546 liters.

How do I convert gallons to liters?

Multiply US gallons by 3.785. For example, 15 gal × 3.785 ≈ 56.8 L.

Why are there two kinds of gallon?

The US kept an older definition while the UK standardized a larger imperial gallon. The US gallon is about 83% of the imperial one.

Conversions

Liters to Gallons

One US gallon is about 3.785 liters. Convert either way for fuel economy, tank and aquarium capacity, and recipes. This uses the US gallon — the UK (imperial) gallon is about 20% larger.

Your numbers

Result

2.64

Unit: gallons

Quick reference (US gallon)
Liters	Gallons
1	0.26
4	1.06
10	2.64
20	5.28
40	10.57
50	13.21

How to convert

To go from liters to US gallons, divide by 3.785: 10 L ÷ 3.785 ≈ 2.64 gal. For the reverse, multiply by 3.785. A US gallon is defined as exactly 3.785411784 liters (231 cubic inches).

US gallon vs imperial gallon

There are two gallons. The US gallon (used here) is 3.785 L; the imperial gallon used in the UK is 4.546 L — about 20% bigger. It matters for fuel economy: "40 miles per gallon" means different things in the US and UK, so always check which gallon a figure uses.