Convert Imperial Gallons to Liters

Convert Imperial Gallons (UK gal) to Liters (L) instantly and accurately.

Conversion Formula

L = UK gal × 4.54609

About Imperial Gallons

A US imperial gallon (UK gal) = exactly 8 imperial pints or 10 lb of pure water at 62°F ≈ 4.546 L - about 20% larger than the US liquid gallon (3.785 L). The weight-based definition made it verifiable with simple scales. Still the legal fuel measure in the Cayman Islands and other British Overseas Territories. UK mpg ratings use imperial gallons: 50 UK mpg ≈ 42 US mpg. 1 UK gal ≈ 4.546 L.

About Liters

A liter (L) is the fundamental metric unit of volume, equal to one cubic decimeter (1 dm³ = 1,000 cm³ = 1,000 mL). Since its adoption as part of the metric system in 1793, the liter has become the world's most widely used volume measurement for liquids. Bottled water, soft drinks, wine, milk, and engine oil are all routinely sold by the liter globally. One liter of pure water at 4°C weighs almost exactly one kilogram - a convenient property that makes the liter central to everyday science, cooking, and industry worldwide. The liter is also written 'litre' in British English.

Quick Reference Table

→ Full Volume Converter