Imperial Gallon to Liter Converter
This tool converts Imperial Gallon (imp gal) to Liter (L) quickly and accurately. Whether you are reading British fuel economy, using older UK recipes, or converting specifications, it delivers instant results as you type.
Understanding the Units
Imperial Gallon (imp gal)
Liter (L)
Who Uses This Conversion?
- UK drivers — understanding fuel economy and tank sizes
- Cooks — working with older British recipes
- Car buyers — reading UK fuel-tank specifications
- Researchers — interpreting historical Commonwealth measures
How to Use
Converting Imperial Gallon to Liter takes just seconds:
Enter the Imperial Gallon Value
Type your value in Imperial Gallon (imp gal) into the first input field.
View the Liter Result
The equivalent value in Liter (L) appears instantly in the second field — no convert button needed.
Copy the Result
Use the copy button to send the result to your clipboard for documents, notes, or other tools.
Reverse Conversion
Need to convert Liter to Imperial Gallon instead? Click the swap button (↔) to reverse the direction, or simply type in the Liter field directly.
Tips for Accurate Conversions
- Use decimal points for precise values (e.g., 10.5 instead of 11)
- Large numbers are automatically formatted with thousand separators
- Results update instantly as you type
- Use the unit dropdowns to switch to any other volume unit
Features
Instant Conversion
Results appear as you type, with no convert button. The calculation uses precise conversion factors for accurate results.
Bidirectional Input
Type in either field and the other updates automatically, so you can work in whichever direction you need.
Copy Results
Click the copy button next to any value to copy it to your clipboard for documents, notes, or other applications.
Quick Reference Table
The reference section shows common Imperial Gallon-to-Liter conversions at a glance for fast lookups.
Unit Flexibility
Use the dropdowns to switch to other volume units — liters, milliliters, gallons, cups, fluid ounces, and many more.
Mobile Friendly
The converter works on all devices — desktop, tablet, and mobile. Convert volume units wherever you need them.
Common Conversions
| Imperial Gallon (imp gal) | Liter (L) |
|---|---|
| 1 imp gal | 4.55 L |
| 2 imp gal | 9.09 L |
| 5 imp gal | 22.73 L |
| 10 imp gal | 45.46 L |
| 15 imp gal | 68.19 L |
| 20 imp gal | 90.92 L |
Frequently Asked Questions
How many liters in an imperial gallon?
One imperial gallon equals 4.546 liters. This is the UK standard, larger than the US gallon.
What's the difference between imperial and US gallons?
An imperial gallon is 4.546 liters, while a US gallon is 3.785 liters. The imperial gallon is about 20% larger.
Why does UK fuel economy look better than US?
Because UK mpg uses larger imperial gallons. A car getting 40 mpg in the UK would only get 33 mpg using US gallons. The actual fuel efficiency is the same — only the measurement differs.
Is the imperial gallon still used?
Yes, in some contexts. The UK uses imperial gallons for fuel economy ratings (mpg), though fuel is sold by the liter. Canada uses imperial gallons for some purposes. Australia and New Zealand have fully converted to metric.
How do I convert UK mpg to L/100km?
Divide 282.48 by the UK mpg. For example: 50 mpg (imperial) = 282.48 ÷ 50 = 5.65 L/100km.
Why are there two different gallons?
The US kept the older English wine gallon (231 cubic inches) when it became independent. Britain redefined its gallon in 1824 based on the weight of water, creating the larger imperial gallon.
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