Precision unit conversion
Volume is where UK and US units genuinely diverge — a UK gallon, pint and fluid ounce are all different sizes to their US namesakes, which causes real confusion with recipes and vehicle fuel figures.
The metric side is straightforward: 1,000 millilitres make a litre, and 1,000 litres make a cubic metre. The imperial/US side is where it gets messy — the UK gallon (4.54609 L) is about 20% larger than the US gallon (3.78541 L), because the two systems were standardised separately in the 19th and 20th centuries and never reconciled.
| Convert | Result |
|---|---|
| 1 UK gallon | 4.54609 L |
| 1 US gallon | 3.78541 L |
| 1 UK pint | 0.568261 L (20 UK fl oz) |
| 1 US pint | 0.473176 L (16 US fl oz) |
| 1 UK fl oz | 28.4131 mL |
| 1 US fl oz | 29.5735 mL |
| 1 US cup | 236.588 mL |
| 1 tablespoon | 14.7868 mL |
Note that a US cup has no direct UK equivalent as a legal unit of measure — UK recipes tend to use weight (grams) or millilitres instead, which is why converting a US recipe often means converting cups to millilitres first.
The full converter includes both UK and US variants for fluid ounces, pints, quarts and gallons side by side, plus teaspoons, tablespoons and US cups.
Open Volume converter →A UK (imperial) gallon is 4.54609 litres — larger than a US gallon, which is 3.78541 litres.
Yes. A UK pint is 568.26 mL, while a US pint is 473.18 mL — the UK pint is about 20% larger.
One tablespoon is 14.7868 mL, based on the standard 15 mL metric tablespoon rounding used in most UK recipes.
Multiply the number of US cups by 236.588. One US cup equals roughly 237 mL, which is why many UK recipe sites round it to that figure.