What is the difference between US and UK fluid ounces?

A US fluid ounce is 29.5735 ml while a UK (imperial) fluid ounce is 28.4131 ml. US recipes use US ounces, so pick the right one for accuracy.

How many ml are in a US fluid ounce?

One US fluid ounce is about 29.57 ml, so 250 ml is roughly 8.45 US fluid ounces.

Does this send my data anywhere?

No. The conversion runs locally in your browser with no network requests.

Millilitres to Fluid Ounces Converter

Convert ml to US and UK fluid ounces, both ways.

Millilitres to fluid ounces converter

Convert between millilitres and fluid ounces in both directions, with separate factors for US and UK (imperial) ounces. US recipes use the US ounce (29.57 ml) while imperial recipes use the slightly smaller UK ounce (28.41 ml).

Pick the conversion, type your amount, and the result updates instantly — all in your browser.