Accurately convert UK gallons (imperial gallons) to litres with our easy-to-use calculator. Essential for anyone working with volume measurements in the UK and other countries using imperial units.
Conversion Formula:
Litres = UK Gallons × 4.54609
1 UK gallon = 4.54609 litres (exact conversion factor)
Enter any non-negative volume value
Precision:
Quick conversions - click to auto-fill:
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Help others convert volume units accurately. This tool is especially useful for cooks, gardeners, and anyone working with liquids in the UK.
Understanding the conversion process helps you verify results and perform calculations manually when needed
The key conversion factor for UK gallons to litres is:
1 UK gallon = 4.54609 litres
This is the official conversion factor defined by international agreement
This precise conversion factor ensures accurate results for both everyday and professional applications.
The formula to convert UK gallons to litres is straightforward:
Litres = UK Gallons × 4.54609
This formula works by multiplying the number of UK gallons by the conversion factor to get the equivalent volume in litres.
Example: Converting 10 UK gallons to litres
Calculation: 10 × 4.54609 = 45.4609 litres
Rounded to 2 decimal places: 45.46 litres
To convert litres back to UK gallons, use the inverse formula:
UK Gallons = Litres ÷ 4.54609
You can also use the approximate factor for quick mental calculations:
UK Gallons ≈ Litres × 0.219969
Example: Converting 50 litres to UK gallons
Calculation: 50 ÷ 4.54609 ≈ 10.998 gallons
Rounded to 2 decimal places: 11.00 gallons
Quick reference table for popular volume measurements converted from UK gallons to litres
| UK Gallons | ≈ | Litres | Typical Scenario |
|---|---|---|---|
| 1 gal | ≈ | 4.55 L | Small container |
| 2 gal | ≈ | 9.09 L | Carry container |
| 5 gal | ≈ | 22.73 L | Jerry can |
| 10 gal | ≈ | 45.46 L | Watering can volume |
| 20 gal | ≈ | 90.92 L | Small fish tank |
| 40 gal | ≈ | 181.84 L | Standard fish tank |
| 50 gal | ≈ | 227.30 L | Drum volume |
| 100 gal | ≈ | 454.61 L | Barrel volume |
| 200 gal | ≈ | 909.22 L | Small storage tank |
| 1000 gal | ≈ | 4546.09 L | Large storage tank |
All conversions are rounded to two decimal places for simplicity. For precise calculations, use our converter tool above.
Answers to common questions about converting UK gallons to litres
There is a significant difference between UK (imperial) gallons and US gallons. A UK gallon is larger, equal to 4.54609 litres, while a US liquid gallon equals approximately 3.78541 litres. This converter specifically handles UK gallons. Always check which gallon measurement you're working with to avoid errors.
The difference dates back to the 19th century when the UK standardized the imperial gallon as 10 pounds of water at 62°F, while the US retained a earlier definition based on wine gallons. This historical divergence created two different measurements that are still in use today, with the UK gallon being approximately 20% larger than the US gallon.
The UK gallon (imperial gallon) is primarily used in the United Kingdom and some of its former colonies. However, most countries have adopted the metric system and use litres as their primary unit of volume measurement. In the UK, litres are now commonly used alongside gallons for certain applications like fuel sales, where both units are often displayed.
Common scenarios include:
Yes, the conversion factor is precisely defined as 1 UK gallon = 4.54609 litres. This is an exact conversion established by international agreement, making conversions between these units both accurate and straightforward. For most practical purposes, rounding to two decimal places (4.55) provides sufficient accuracy.
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