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Convert between UK Imperial volume units (gallons, pints, fluid ounces, quarts) and metric (liters, milliliters). Includes US vs UK comparison table.
Imperial volume conversion translates between the UK Imperial measurement system (gallons, pints, fluid ounces, quarts) and the metric system (liters, milliliters) using standardized factors defined by the 1985 Weights and Measures Act.
Formula
L = UK gal × 4.546094.54609 = exact definition: 1 Imperial gallon = 4.54609 litres (since 1985 Weights and Measures Act)
UK gal = Imperial gallon, used in the UK, Canada (historically), and other Commonwealth countries
L = litre, the standard metric unit of volume
Worked Example
Convert 3 UK pints to liters
Did you know? The Imperial gallon was defined in 1824 as the volume of 10 pounds of distilled water weighed in air at 62 °F with a barometer at 30 inches of mercury. This made it about 20% larger than the US gallon.
Sources
| Unit | UK (Imperial) | US (Customary) |
|---|---|---|
| Gallon | 4,546.09 mL | 3,785.41 mL |
| Quart | 1,136.52 mL | 946.353 mL |
| Pint | 568.261 mL | 473.176 mL |
| Fluid Ounce | 28.4131 mL | 29.5735 mL |
| UK Gallons | Liters |
|---|---|
| 1 UK gal | 4.55 L |
| 2 UK gal | 9.09 L |
| 5 UK gal | 22.73 L |
| 10 UK gal | 45.46 L |
| 20 UK gal | 90.92 L |
| 50 UK gal | 227.30 L |
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