Imperial gallons to Litres
1 imperial gallon = 4.5461 litres · 1 L = 0.21997 gal (UK)
1 imperial gallon = 4.5461 litres
How it’s calculated
L = gal (UK) × 4.54609
- Multiply the value in imperial gallons by 4.54609.
- To go back, divide by 4.54609 (or multiply by 0.2199692483).
- 1 gal (UK) = 4.54609 L · 1 L = 0.2199692483 gal (UK)
Show worked solutionFactor, unit cancellation and rounding, step by step
Find the conversion factor
By definition 1 gal (UK) = 0.00454609 m³ and 1 L = 0.001 m³, so 1 gal (UK) = 4.54609 L. Source: NIST SP 811 / Handbook 44; BIPM SI Brochure (9th ed.).
Multiply by the factor written as a fraction
Put gal (UK) in the denominator so it cancels, leaving L.
Calculate (unrounded)
Round the answer
Rounded to 5 significant figures.
Answer: 4.5461 L
1 gal (UK) in other units
Batch convert gal (UK) → L
- 1 gal (UK) = 4.5461 L
- 5 gal (UK) = 22.73 L
- 10 gal (UK) = 45.461 L
- 25 gal (UK) = 113.65 L
Quick examples
- 1 imperial gallon = 4.5461 litres
- 5 imperial gallons = 22.73 litres
- 10 imperial gallons = 45.461 litres
- 25 imperial gallons = 113.65 litres
- 100 imperial gallons = 454.61 litres
About these units
Imperial gallon (gal (UK))
British imperial
Exactly 4.546 09 L. About 20% larger than the US gallon.
1 gal (UK) = 0.00454609 m³
Source: NIST SP 811 / Handbook 44
Litre (L)
metric (non-SI)
Exactly 1 dm³ = 0.001 m³.
1 L = 0.001 m³
Source: BIPM SI Brochure (9th ed.)
Imperial gallons to litres conversion table
| Imperial gallons (gal (UK)) | Litres (L) |
|---|---|
| 0.1 gal (UK) | 0.45461 L |
| 0.5 gal (UK) | 2.273 L |
| 1 gal (UK) | 4.5461 L |
| 2 gal (UK) | 9.0922 L |
| 3 gal (UK) | 13.638 L |
| 4 gal (UK) | 18.184 L |
| 5 gal (UK) | 22.73 L |
| 6 gal (UK) | 27.277 L |
| 7 gal (UK) | 31.823 L |
| 8 gal (UK) | 36.369 L |
| 9 gal (UK) | 40.915 L |
| 10 gal (UK) | 45.461 L |
| 15 gal (UK) | 68.191 L |
| 20 gal (UK) | 90.922 L |
| 25 gal (UK) | 113.65 L |
| 30 gal (UK) | 136.38 L |
| 40 gal (UK) | 181.84 L |
| 50 gal (UK) | 227.3 L |
| 75 gal (UK) | 340.96 L |
| 100 gal (UK) | 454.61 L |
| 250 gal (UK) | 1,136.5 L |
| 500 gal (UK) | 2,273 L |
| 1,000 gal (UK) | 4,546.1 L |
Related conversions
Frequently asked questions
How do I convert imperial gallons to litres?
Use L = gal (UK) × 4.54609. Multiply the value in imperial gallons by 4.54609.
How many litres are in 1 imperial gallon?
1 imperial gallon (gal (UK)) equals 4.5461 litres (L); more precisely 4.54609.
How many imperial gallons are in 1 litre?
1 litre (L) equals 0.21997 imperial gallons (gal (UK)); more precisely 0.2199692483.
What is 10 gal (UK) in L?
10 imperial gallons = 45.461 litres.
Is the imperial gallon a US or a UK unit?
This converter uses the British imperial imperial gallon. Exactly 4.546 09 L. About 20% larger than the US gallon. US and UK units with the same name can differ, so check which one your source uses.
What is a imperial gallon?
Exactly 4.546 09 L. About 20% larger than the US gallon.
What is a litre?
Exactly 1 dm³ = 0.001 m³.
Formula: L = gal (UK) × 4.54609. Factors last reviewed 2026-10-27.