Imperial Gallon to Liter Converter
Convert Imperial Gallon to Liter — free, instant, accurate. Part of Volume converters.
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Imperial Gallon to Liter: values and formula
1 Imperial Gallon = 4.54609 Liter, and 1 Liter = 0.2199692483 Imperial Gallon. To convert a volume value from Imperial Gallon to Liter, multiply it by 4.54609. For example, 10 Imperial Gallon equals 45.4609 Liter, and 250 Imperial Gallon equals 1136.5225 Liter.
| Imperial Gallon | Liter |
|---|---|
| 1 Imperial Gallon | 4.54609 Liter |
| 2 Imperial Gallon | 9.09218 Liter |
| 5 Imperial Gallon | 22.73045 Liter |
| 10 Imperial Gallon | 45.4609 Liter |
| 25 Imperial Gallon | 113.65225 Liter |
| 50 Imperial Gallon | 227.3045 Liter |
| 100 Imperial Gallon | 454.609 Liter |
| 500 Imperial Gallon | 2273.045 Liter |
| 1000 Imperial Gallon | 4546.09 Liter |
When to use the Imperial Gallon to Liter converter
- Recipe conversion — cups, millilitres, and fluid ounces for international cooking.
- Fuel economy — comparing miles-per-gallon (US vs imperial) and litres-per-100 km.
- Brewing and bartending — switching pints, half-pints, and millilitres.
- Chemistry and lab work — precise mL-to-cubic-cm conversions.
A short history of volume units
Volume units split into two main families: metric (litre, derived from the cubic decimetre) and imperial (gallon, quart, pint, fluid ounce). The litre was defined in 1795 alongside the metre. The US gallon (231 cubic inches, 3.785 L) and the imperial gallon (4.546 L) diverged after the UK redefined its gallon in 1824, which is why an American pint is 473 mL and a British pint is 568 mL.
Common mistakes when converting volume
US vs imperial gallon
A US gallon is about 16% smaller than an imperial gallon. A car rated 30 US mpg is roughly 36 imperial mpg.
Fluid ounce vs ounce
A fluid ounce is a volume; an ounce is a weight. They are different quantities and only match for water at specific conditions.
Confusing cubic centimetre with millilitre rules of thumb
1 cm³ equals 1 mL exactly — this is by definition, not approximation.
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