Convert imperial gallons to liters

One imperial gallon equals 4.54609 liters. To convert any number of imperial gallons to liters, multiply by 4.54609.

The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.

Volume is the category where the US and imperial systems diverge most damagingly. Gallons, quarts, pints and fluid ounces all exist in two sizes that differ by up to 20%, and nothing in the name warns you which one a figure uses. Recipes, fuel economy figures and container capacities all cross borders regularly, so it is worth checking which system a source is using before converting rather than after.

imperial gallons to liters formula

To go the other way, use imperial gallon = liter ÷ 4.54609.

About these units

The imperial gallon is 4.546 litres — roughly 20% larger than the US gallon. This is why UK miles-per-gallon figures look better than American ones for the same car.

A litre is exactly one cubic decimetre, or 1,000 cubic centimetres. One litre of water weighs almost exactly one kilogram, which is not a coincidence.

Imperial Gallon is also written imperial gallons and uk gallon. Liter is also written litre, litres, liters and ltr.

Sources

1. NIST Special Publication 811, Guide for the Use of the International System of Units (SI), 2008 edition — conversion factors for units outside the SI.