How to convert UK gallons to litres
One UK gallon equals 4.5461 litres, so multiply the number of UK gallons by 4.5461:
L = UK gal × 4.5461
UK gal = L ÷ 4.5461 (1 L = 0.219969 UK gal)
Example: 5 UK gal → 5 × 4.5461 = 22.7305 L.
Going the other way, divide by 4.5461, or multiply by 0.219969; the litres to UK gallons converter does it for you.
Everyday values
| UK gallons | Litres | For example |
|---|---|---|
| 1 UK gal | 4.5461 L | one imperial gallon |
| 5 UK gal | 22.7305 L | a jerrycan, roughly |
| 10 UK gal | 45.4609 L | 10 gallons |
| 12 UK gal | 54.5531 L | a small car's tank, roughly |
When you need this conversion
One imperial gallon is 4.546 litres. UK drivers buy fuel in litres but compare economy in miles per imperial gallon; see the fuel economy calculator.
UK gallon to litre conversion table
| UK gal | L | UK gal | L |
|---|---|---|---|
| 1 UK gal | 4.5461 L | 13 UK gal | 59.0992 L |
| 2 UK gal | 9.0922 L | 14 UK gal | 63.6453 L |
| 3 UK gal | 13.6383 L | 15 UK gal | 68.1913 L |
| 4 UK gal | 18.1844 L | 16 UK gal | 72.7374 L |
| 5 UK gal | 22.7305 L | 17 UK gal | 77.2835 L |
| 6 UK gal | 27.2765 L | 18 UK gal | 81.8296 L |
| 7 UK gal | 31.8226 L | 19 UK gal | 86.3757 L |
| 8 UK gal | 36.3687 L | 20 UK gal | 90.9218 L |
| 9 UK gal | 40.9148 L | 21 UK gal | 95.4679 L |
| 10 UK gal | 45.4609 L | 22 UK gal | 100.014 L |
| 11 UK gal | 50.007 L | 23 UK gal | 104.56 L |
| 12 UK gal | 54.5531 L | 24 UK gal | 109.106 L |
About the units
- UK gallon (UK gal): the imperial gallon, exactly 4.54609 litres.
- Litre (L): one cubic decimetre (1,000 cm³).
Both are units of volume. The conversion factor comes from the exact definitions above, so the calculator is exact; results are only rounded for display (up to six significant digits).
Frequently asked questions
How many litres are in one UK gallon?
One UK gallon is 4.5461 litres. One litre is 0.219969 UK gallons.
How do I convert UK gallons to litres?
Multiply the value in UK gallons by 4.5461. To go back, divide by 4.5461.
What is 5 UK gal in litres?
5 UK gal = 22.7305 L.
What is 10 UK gal in litres?
10 UK gal = 45.4609 L.
Sources
- NIST Special Publication 811 (2008), Guide for the Use of the International System of Units (SI), Appendix B: conversion factors.
- NIST Handbook 44 (2024), Appendix C: General tables of units of measurement.
Last reviewed 5 October 2026. Results are estimates; see our disclaimer.