Gallons to Liters Converter

About the gal to l calculation

One gallon is exactly 3.7854 liters, so converting between them is a single multiplication. Enter any value above and the result updates as you type. The US gallon is 3.785 L. The imperial gallon is 4.546 L — a 20% difference. The metric volume standard — one litre is exactly 1,000 cm³.

Formula

L = gal × 3.7854

1 gal = 3.7854 L
1 L = 0.264172 gal

Worked example

To convert 1 gal, multiply by 3.7854: 1 × 3.7854 = 3.7854 L.

Frequently asked questions

How many liters are in a gallon?

There are 3.7854 liters in one gallon. To convert any amount, multiply the number of gallons by 3.7854.

How do I convert liters back to gallons?

Divide instead of multiplying, or equivalently multiply by 0.264172. One liter is 0.264172 gallons.

Is this conversion exact?

Yes. Since the international agreement of 1959, the relationship between gallons and liters is defined exactly rather than measured, so the only rounding here is in how many decimal places we show.

Is there anything that catches people out here?

This is the US gallon (3.785 L). An imperial gallon, still used in the UK, is 4.546 L — about 20% larger. Check which one a recipe or fuel figure means before converting.

Sources

• NIST Special Publication 811 — Guide for the Use of the International System of Units