- UK Gallons to Liters
Imperial Gallon to Liter Converter
Older UK water tanks, boilers, and fuel containers still display their capacity in gallons, whereas modern specification sheets, warranty forms, and online calculators require values in liters. Matching these units manually can lead to costly errors. The formula for converting Imperial gallons to liters easily resolves this discrepancy: one British gallon is exactly equal to 4.54609 liters, turning this complex conversion into a simple and accurate calculation.
What Is an Imperial Gallon: Quick Overview
The imperial gallon is a unit of volume used in the United Kingdom (UK) and some Commonwealth countries. Its exact value is 4.54609 liters. Therefore, to convert an imperial gallon to liters, one simply multiplies it by this figure (4.54609).
- It is abbreviated as “imp gal,” or “gal” (especially in the UK).
- One imperial gallon is equal to 4.54609 liters, 277.42 cubic inches.
- An imperial gallon is divided into 4 imperial quarts or 8 imperial pints.
- In the UK, the imperial gallon is still used to express vehicle fuel economy (miles per gallon).
History of the Imperial Gallon
The imperial gallon was officially established by the British Weights and Measures Act of 1824, which replaced the various older definitions of the gallon used in British trade. It was originally based on the volume of 10 pounds of distilled water, a definition that was later refined through more precise density measurements.
It was adopted across all territories of the British Empire, and under current UK weights and measures legislation, its legal definition remains exactly 4.54609 liters.
What Is a Liter?
The litre is the standard metric unit of volume. It is defined as the volume of a cube with a side length of 10 centimetres. It is the unit you will see on every fuel pump and water bottle in the UK, as well as in recipes that do not rely on Imperial gallon to litre conversion charts.
- It is abbreviated as L or l.
- It is equal to 1,000 cubic centimetres (cm³) or 1,000 millilitres (ml).
- It is the legal unit for the sale of fuel and most liquids in the UK and the European Union.
- 1 litre is approximately equal to 0.22 Imperial gallons.
- It is used worldwide, making it the primary reference point for most conversions.
History of the Liter
The litre originated from the French metric system, which was introduced in the 1790s. It was first defined in 1795 as being equal to the volume of one cubic decimetre (1 dm³). In 1901, its definition was temporarily altered, basing the litre on the mass (weight) of pure water.
In 1964, the original definition was reinstated. The litre was once again defined as equivalent to the volume of one cubic decimetre.
Imperial Gallon to Liter Conversion Chart
This table summarizes the imperial gallon to liter conversion chart. You can check all conversions with this table.
| Imperial Gallons → Liters (L) | Imperial Gallons → Liters (L) | Imperial Gallons → Liters (L) | Imperial Gallons → Liters (L) |
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Imperial Gallon to Liter Conversion Formula
It is very easy to convert imperial gallons to liters and vice versa. You can check both formulas below.
1 imperial gallon = 4.54609 liters
To convert:
- Imperial gallons to liters: multiply by 4.54609
- Liters to imperial gallons: divide by 4.54609 (or multiply by 0.219969)
Example: A European supplier lists a container as 200 liters. 200 ÷ 4.54609 = 43.99 Imperial gallons. This is useful when a UK buyer wants to compare it with a locally rated 44 gallon drum. Mixing the two measurements can lead to conversion errors.
How to Use the Imperial Gallon to Liter Calculator
The gallon to liter converter saves you from having to memorize the conversion factor of 4.54609. It is useful when you need to convert multiple quantities in succession.
- Enter the quantity in Imperial gallons into the input field.
- The calculator multiplies the value by 4.54609 and displays the result in liters.
- If you wish to convert liters back to Imperial gallons, then enable the “Swap Units” option.
- Adjust the number of decimal places according to your needs, whether you want a simple estimate or a highly precise result.
- Always ensure you have selected imperial gallons.
A practical example: A UK based logistics company is converting the fuel tank capacity of its vehicle fleet from Imperial gallons (an older unit of measurement) to liters in order to utilize a modern fuel management system.
They enter the vehicle’s specified tank capacity (25 Imperial gallons) into the system and immediately obtain the result: 113.65 liters. This eliminates the need to manually recalculate the figures for dozens of vehicles.
Frequently Ask Questions
Why does the UK still use imperial gallons?
The UK uses the metric system today and sells fuel in litres. The imperial gallon survives in everyday culture because it is deeply ingrained in British identity.
How do I convert liters back to imperial gallons?
You can divide the number of liters by 4.54609 to convert liters back to imperial gallons.
Is the imperial gallon still used outside the UK?
Yes, the imperial gallon (4.546 liters) is still used outside the UK, mostly in the Caribbean and Canada.
Is 4 liters roughly 1 imperial gallon?
No, 4 liters is not equal to 1 imperial gallon. An imperial gallon is exactly 4.546 liters. while 4 liters is less than a full imperial gallon.