Gallons to litres
Convert UK gallons to litres. To convert UK gallons to litres, multiply by 4.546.
Factors from their legal definitions.
Show the workings
| Step | Sum | Answer |
|---|---|---|
| One UK gallon in litres | 4.54609 litres | 4.546 litres |
| In litres | 1 × 4.546 | 4.546 litres |
Where the figures come from
- A UK (imperial) gallon in litres: 4.546 litres per gallon. Source: Weights and Measures Act 1985, Schedule 1. Checked 13 November 2026.
Gallons to litres table
| UK gallons | Litres |
|---|---|
| 0.5 gallons | 2.273 litres |
| 1 gallons | 4.546 litres |
| 2 gallons | 9.092 litres |
| 3 gallons | 13.638 litres |
| 4 gallons | 18.184 litres |
| 5 gallons | 22.73 litres |
| 6 gallons | 27.277 litres |
| 7 gallons | 31.823 litres |
| 8 gallons | 36.369 litres |
| 9 gallons | 40.915 litres |
| 10 gallons | 45.461 litres |
| 12 gallons | 54.553 litres |
| 15 gallons | 68.191 litres |
| 20 gallons | 90.922 litres |
| 25 gallons | 113.652 litres |
| 30 gallons | 136.383 litres |
| 40 gallons | 181.844 litres |
| 50 gallons | 227.305 litres |
| 75 gallons | 340.957 litres |
| 100 gallons | 454.609 litres |
How to convert UK gallons to litres
One UK gallon is 4.546 litres, and one litre is 0.22 UK gallons. So to turn UK gallons into litres, multiply by 4.546. For example, 1 UK gallons × 4.546 = 4.546 litres.
Where the numbers come from
Imperial units are defined in law as exact amounts of metric ones. These are the definitions this converter uses:
- A UK (imperial) gallon in litres: 4.546 litres per gallon. Source: Weights and Measures Act 1985, Schedule 1.
These are UK (imperial) gallons. A US gallon is smaller: 3.785 litres.