This converter turns imperial gallons into liters instantly, using the exact factor 1 imperial gallon = 4.54609 liters. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
Exactly 4.54609 litres, about 20% larger than the US gallon. One cubic decimetre — the everyday metric unit for drinks and fuel.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
imperial gallons- The amount you are converting, measured in imperial gallons
4.54609- The exact number of liters in one imperial gallon
liters- The converted result
How it works, step by step
- Enter the number of imperial gallons you want to convert.
- The value is multiplied by 4.54609, the exact conversion factor.
- The result is displayed in liters, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 imperial gallons
Multiply 5 by 4.54609. That gives 22.7305 liters. A quick sanity check: one imperial gallon is larger than one liter, so the number should get bigger — and it does.
Converting 72 imperial gallons
72 × 4.54609 = 327.3185 liters. Working backwards, 327.3185 ÷ 4.54609 returns 72 imperial gallons, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many liters are in one imperial gallon?
Exactly 4.54609. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert imperial gallons to liters?
Liters = imperial gallons × 4.54609. To reverse it, divide instead: imperial gallons = liters ÷ 4.54609, which is the same as multiplying by 0.2199692483.
Is the imperial gallon bigger than the liter?
Yes. One imperial gallon equals 4.54609 liters, so it is the larger unit.
Why does my answer differ slightly from other imperial-gallons to liters converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a imperial gallon?
Exactly 4.54609 litres, about 20% larger than the US gallon.
What is a liter?
One cubic decimetre — the everyday metric unit for drinks and fuel.
Imperial Gallons to liters reference table
| Imperial Gallons | Liters |
|---|---|
| 0.5 gal | 2.273 L |
| 1 gal | 4.5461 L |
| 2 gal | 9.0922 L |
| 3 gal | 13.6383 L |
| 5 gal | 22.7305 L |
| 10 gal | 45.4609 L |
| 15 gal | 68.1913 L |
| 20 gal | 90.9218 L |
| 25 gal | 113.6523 L |
| 50 gal | 227.3045 L |
| 75 gal | 340.9568 L |
| 100 gal | 454.609 L |
| 250 gal | 1,136.52 L |
| 500 gal | 2,273.05 L |
| 1000 gal | 4,546.09 L |
Exact factor: 1 imperial gallon = 4.54609 liters. Values rounded for display.