UK Gallons to Liters (imp gal to L) Converter
1 UK gallon (imp gal) = 4.54609 liters (L). To convert UK gallons to liters, multiply by 4.54609: 25 imp gal × 4.54609 = 113.652 L. Also searched as imperial gallons to litres, UK gallon to litres, gallons to litres UK, UK gallons to litres.
Quick facts
- 1 imp gal = 4.54609 L
- 1 L = 0.219969 imp gal
- Formula: L = imp gal × 4.54609
- Quick estimate: multiply by about 4.5
How to convert UK gallons to liters
- Take the value in UK gallons.
- Multiply it by 4.54609 (the number of liters in one UK gallon).
- Check the answer: it should be larger than the number you started with.
Worked example: 25 imp gal × 4.54609 = 113.652 L.
To convert liters back to UK gallons, multiply by 0.219969, or divide by 4.54609.
Source: NIST Handbook 44, Appendix C, and NIST SP 811 (US customary volume units).
UK Gallons to Liters conversion table
| UK Gallons [imp gal] | Liters [L] |
|---|---|
| 0.01 imp gal | 0.0454609 L |
| 0.1 imp gal | 0.454609 L |
| 1 imp gal | 4.54609 L |
| 2 imp gal | 9.09218 L |
| 3 imp gal | 13.63827 L |
| 5 imp gal | 22.73045 L |
| 10 imp gal | 45.4609 L |
| 20 imp gal | 90.9218 L |
| 50 imp gal | 227.3045 L |
| 100 imp gal | 454.609 L |
| 1000 imp gal | 4546.09 L |
imp gal to L chart from 1 to 100
- 1 imp gal 4.54609 L
- 2 imp gal 9.09218 L
- 3 imp gal 13.6383 L
- 4 imp gal 18.1844 L
- 5 imp gal 22.7305 L
- 6 imp gal 27.2765 L
- 7 imp gal 31.8226 L
- 8 imp gal 36.3687 L
- 9 imp gal 40.9148 L
- 10 imp gal 45.4609 L
- 11 imp gal 50.007 L
- 12 imp gal 54.5531 L
- 13 imp gal 59.0992 L
- 14 imp gal 63.6453 L
- 15 imp gal 68.1914 L
- 16 imp gal 72.7374 L
- 17 imp gal 77.2835 L
- 18 imp gal 81.8296 L
- 19 imp gal 86.3757 L
- 20 imp gal 90.9218 L
- 25 imp gal 113.652 L
- 30 imp gal 136.383 L
- 35 imp gal 159.113 L
- 40 imp gal 181.844 L
- 45 imp gal 204.574 L
- 50 imp gal 227.305 L
- 55 imp gal 250.035 L
- 60 imp gal 272.765 L
- 65 imp gal 295.496 L
- 70 imp gal 318.226 L
- 75 imp gal 340.957 L
- 80 imp gal 363.687 L
- 85 imp gal 386.418 L
- 90 imp gal 409.148 L
- 95 imp gal 431.879 L
- 100 imp gal 454.609 L
Liters to UK Gallons conversion table
| Liters [L] | UK Gallons [imp gal] |
|---|---|
| 0.01 L | 0.0021996925 imp gal |
| 0.1 L | 0.0219969248 imp gal |
| 1 L | 0.2199692483 imp gal |
| 2 L | 0.4399384966 imp gal |
| 3 L | 0.6599077449 imp gal |
| 5 L | 1.0998462415 imp gal |
| 10 L | 2.199692483 imp gal |
| 20 L | 4.399384966 imp gal |
| 50 L | 10.998462415 imp gal |
| 100 L | 21.9969248299 imp gal |
| 1000 L | 219.9692482991 imp gal |
UK Gallons vs Liters
| UK Gallon | Liter | |
|---|---|---|
| Symbol | imp gal | L |
| Equals | 1 imp gal = 4.54609 L | 1 L = 0.219969 imp gal |
What is a UK gallon?
The imperial gallon, defined as exactly 4.54609 litres (UK Weights and Measures Act 1985); about 20% larger than the US gallon. Used in the UK and Canada for fuel economy (miles per gallon), garden and aquarium volumes, and older fuel prices.
What is a liter?
The common metric unit of volume, equal to one cubic decimeter. The standard volume unit worldwide for beverages and fuel outside the US.
Imperial gallons to litres
Imperial gallons appear in older UK and Canadian recipes, garden water butts, aquarium sizes and fuel-economy figures. Multiply by 4.54609 (exact) to get litres.
- 1 imp gal = 4.54609 L
- 5 imp gal = 22.73 L
- 10 imp gal = 45.461 L
- 45 imp gal (a typical water butt) = 204.6 L
Fuel economy tip: to turn UK mpg into litres per 100 km, divide 282.481 by the mpg figure. A car doing 50 mpg (UK) uses about 5.65 L/100 km.
Where You Will Meet UK Gallons and Liters
UK gallons are used mainly in the UK (pub pints, fuel economy in mpg) and older Canadian recipes, while liters are used mainly in Canada, the UK and most of the world, and in US science, medicine and nutrition labels. Canada and the UK use a mix of metric and imperial units while the US uses customary units, so students, engineers, travellers and shoppers in all three countries switch between them often.
How big is 1 imp gal compared with 1 L?
1 imp gal is 4.54609 times the size of 1 L, so the number gets bigger when you convert UK gallons to liters.
UK Gallons to Liters without a calculator
- In your head: multiply by 5 (about 10% off). 10 imp gal × 5 ≈ 50 L.
- Closer estimate: multiply by 4.5 (within 1%).
- Fraction trick: multiply by 32, then divide by 7 (within 0.56%).
Real-world imp gal to L examples
| Example | UK Gallons | Liters |
|---|---|---|
| One imperial gallon | 1 imp gal | 4.54609 L |
| A small aquarium | 10 imp gal | 45.4609 L |
| A garden water butt | 45 imp gal | 204.574 L |
| A large water bottle | 0.329954 imp gal | 1.5 L |
| A bottle of cola | 0.439938 imp gal | 2 L |
| A car fuel tank | 10.9985 imp gal | 50 L |
How exact is the imp gal to L factor?
The factor is exact by definition, so any error comes only from rounding. For everyday use, 3 significant figures are plenty; for engineering or invoices, keep 5 or more.
Mistakes to avoid
- This page uses the imperial (UK) measure. A US measure with the same name is smaller, so make sure your source is British or older Canadian.
Background on UK gallons and liters
The imperial gallon was introduced in 1824 and is defined as exactly 4.54609 litres.
The litre was redefined in 1964 as exactly one cubic decimetre.
Related conversions
People who convert uk gallons to liters often need us gallons to liters, liters to us gallons, liters to milliliters and liters to us cups. The full volume converter lists every unit.
On pakmath.com, the scientific calculator is a useful next step; Adzita offers a free gas mileage calculator.
Frequently asked questions
How many litres are in a UK gallon?
Exactly 4.54609 litres.
How do I convert UK mpg to L/100 km?
Divide 282.481 by the mpg figure. For example, 40 mpg (UK) is about 7.06 L/100 km.
How many liters are in a UK gallon?
There are 4.54609 liters in 1 UK gallon (1 imp gal = 4.54609 L).
How many UK gallons are in a liter?
There are 0.219969 UK gallons in 1 liter (1 L = 0.2199692483 imp gal).
How do I convert UK gallons to liters?
Use L = imp gal × 4.54609. So 10 imp gal becomes 45.4609 L; for the reverse, multiply by 0.219969.
What is 10 imp gal in liters?
10 imp gal = 45.4609 L.
What is 100 imp gal in liters?
100 imp gal = 454.609 L.
How accurate is this UK gallon to liter converter?
Yes. The factor comes from the official definitions of both units (NIST Handbook 44, Appendix C, and NIST SP 811 (US customary volume units)). Results are shown to up to 10 decimal places; round them to suit your purpose.
What is an easy way to convert UK gallons to liters?
In your head: multiply by 5 (about 10% off). 10 imp gal × 5 ≈ 50 L.
How many liters is 45 imp gal (a garden water butt)?
45 imp gal = 204.574 L.
How many UK gallons is a large water bottle (1.5 L)?
1.5 L = 0.329954 imp gal.
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