Imperial gallons to Liters Converter
Convert Imperial gallons (imp gal) to Liters (L) instantly, or use the conversion table below to look up common values.
Imperial gallons to Liters conversion table
| Imperial gallons (imp gal) | Liters (L) |
|---|---|
| 1 | 4.54609 |
| 2 | 9.09218 |
| 3 | 13.63827 |
| 4 | 18.18436 |
| 5 | 22.73045 |
| 10 | 45.4609 |
| 25 | 113.65225 |
| 50 | 227.3045 |
| 100 | 454.609 |
How to convert Imperial gallons to Liters
1 imp gal equals 4.54609 L. Use the converter above for any value, or read the table for common conversions.
L = imp gal × 4.54609 · imp gal = L × 0.21996924829908776Multiply a imperial gallons figure by 4.54609 to get liters, or divide it by 0.219969 to go the other way.
Worked examples
- 1 imp gal= 4.54609 L
- 2 imp gal= 9.09218 L
- 5 imp gal= 22.73045 L
- 10 imp gal= 45.4609 L
- 20 imp gal= 90.9218 L
What these units are
Imperial gallons (imp gal). An imperial gallon is 4.54609 liters, about 20% more than a US gallon. It is the traditional UK and Commonwealth liquid unit, now largely replaced by liters.
Liters (L). A liter is one thousandth of a cubic meter. It is the everyday metric unit for liquids — bottled water, fuel, milk and cooking oil.
US and imperial units are kept separate because they are genuinely different sizes. Confirm which system a source means before trusting a converted figure.
Converting Imperial gallons to Liters in practice
Reading the result in liters
The liter is exactly one cubic decimeter, or 0.001 cubic meters, and it equals 1,000 milliliters. It is accepted for use with the International System as a named unit of volume.
Fuel, bottled water, cooking oil, paint, milk and engine coolant are sold in liters in most countries, and vehicles quote fuel use in liters per 100 kilometers. Recipes use the unit as well.
A liter is exactly 0.001 cubic meters by definition, so the liter to milliliter and liter to cubic meter conversions are exact. Rounded display means a liter value converted to gallons and back may not return identically.
The judgement call is which gallon: this site uses the US gallon of exactly 3.785411784 liters, not the imperial gallon of 4.54609 liters. Mixing the two understates or overstates a fuel or water volume by roughly twenty percent.
Liters and milliliters differ by a thousand and share the metric scale, while the US gallon is a separate unit near 3.79 liters. Fuel and drinks are sold in those measures, so a metric recipe written in US cups or fluid ounces needs converting first.
Checking a imperial gallons to liters conversion
The metric volume units are a clean decimal chain around the liter, so liters to milliliters is a shift of three places and cubic meters to liters is a shift of three the other way. Those pairs a reader can do without a converter.
Every pair that names a US or imperial liquid unit has to go through the definition first, because three of these units differ from a metric unit by amounts too large to round away: a liter is not a quart, a gallon is 3.785411784 liters in the US system and 4.54609 in the imperial one, and a US fluid ounce is not an imperial fluid ounce.
When checking a volume conversion, convert into liters and out again, or measure the container. The mistake that survives every other check is reading a US measure as the imperial unit of the same name, which changes a recipe, a fuel figure or a tank size by about a fifth.
Tanzania reference points
Real quantities, converted into the units on this page.
The 20-litre bucket or canister used to carry water in Tanzania
20 L = 4.399385 imp gal
WaterAid puts the minimum daily water need per person at 20 litres, so one container is roughly one person's daily requirement.
Source: IPS News — water access in Tanzania, citing WaterAid · verified 2026-09-14
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