Millilitres to Fluid Ounces Converter

A UK fluid ounce is 28.41ml, while a US fluid ounce is 29.57ml. This means the US fluid ounce is about 4% larger. For small quantities, the difference is negligible, but it becomes significant in larger volumes.

A UK pint is 568ml (20 UK fl oz), while a US pint is 473ml (16 US fl oz). This is a significant difference — a UK pint is about 20% larger than a US pint.

The US customary cup used in recipes is 8 US fl oz = 236.6ml, and this converter uses that figure for its cups result. The US also has a 240ml "legal" cup for nutrition labelling. There is no standard UK cup, but the metric cup used in Australian cooking is 250ml (about 8.8 UK fl oz). You can change the cup volume under Advanced Options.

Historically, the British Imperial system and the US Customary system diverged after American independence. The UK gallon is defined as 4.546 litres, while the US gallon is 3.785 litres. All smaller units (pints, fluid ounces) scale accordingly.

No. A UK fluid ounce is 28.41ml, while a US fluid ounce is 29.57ml — the US fluid ounce is slightly larger. For most cooking purposes the difference is negligible, but for precise baking it can matter when scaling recipes. This converter handles both systems.