UK gallons to litres – convert gal (UK) to L
Convert UK gallons to litres for fuel, water tanks, brewing, aquariums, and more. This page links to the main volume converter with UK gallons → litres pre-selected.
Open the interactive UK gallons → litres converter:
Use main converter (gal UK → L) or switch to litres → UK gallonsOn the homepage you can also switch to US gallons, cubic metres, millilitres and more using the dropdowns.
Quick reference: UK gallons to litres
The converter uses the exact factor 1 UK gallon = 4.54609 litres. Some handy rounded values:
| UK gallons (gal) | Litres (L, approx.) |
|---|---|
| 1 gal | 4.55 L |
| 2 gal | 9.09 L |
| 5 gal | 22.7 L |
| 10 gal | 45.5 L |
| 20 gal | 90.9 L |
| 50 gal | 227 L |
Why convert UK gallons to litres?
People often convert UK gallons to litres when they:
- Compare fuel tank sizes between older UK specs and modern litre-based ones.
- Size water butts, storage tanks, or aquarium volumes in metric units.
- Follow brewing or distilling recipes written in imperial gallons.
- Work with engineering or plumbing documents that mix imperial and metric.
More volume converters on this site
On the main converter, all volume units convert through cubic metres as a base, keeping litres, gallons and other units consistent with each other.
Page last updated: 2 December 2025.