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Millilitres to US fluid ounces converter

250 millilitres is equal to 8.45 US fluid ounces. Both units measure volume, so the conversion is exact for the selected measurement system.

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250 millilitres is equal to

8.45

US fluid ounces

Unit conversion using the selected measurement definitions.

More precision: 8.4535 US fluid ounces.

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Volume depends on the ingredient and the measuring method. Results crossing weight and volume are recipe estimates.

Millilitres to US fluid ounces table

US customary definitions. Values rounded to four decimals.

Millilitres to US fluid ounces, US customary definitions
Millilitres	US fluid ounces
5 ml	0.1691
15 ml	0.5072
50 ml	1.6907
100 ml	3.3814
200 ml	6.7628
250 ml	8.4535
500 ml	16.907
1,000 ml	33.814

Formula. US fluid ounces = millilitres × 0.0338. Example: 250 ml → 8.4535 US fluid ounces.

How to convert millilitres to US fluid ounces

Both units measure volume, so no ingredient is involved. The converter turns your input into a shared base unit (millilitres) and divides by the target unit's factor. One millilitre is 1 millilitres; one US fluid ounce is 29.5735 millilitres.

The full factors are kept until the final display is rounded. Use the "more precision" line on the result card when you need more decimals, and remember that a rounded kitchen fraction is a convenience rather than an exact equivalent.

Choose the measurement your recipe means

The default cup is US customary at 236.5882365 ml. Metric and Australian cups use 250 ml. A metric tablespoon is 15 ml; an Australian tablespoon is 20 ml. Fluid ounces, pints, quarts and gallons in this interface stay US liquid units whichever cup system you select.

An ounce by weight measures mass; a fluid ounce measures volume. They are different units. If your recipe gives a dry ingredient in ounces, select "Ounces, weight (oz)" and then the ingredient for any conversion to cups. Eight US fluid ounces make a US cup, but that is not a rule for dry ounces.

Reverse: US fluid ounces to millilitres

A few useful answers

Kitchen questions, answered.

Do I need to choose an ingredient?

Not for this pair: both units measure the same dimension. You will need an ingredient if you switch between a weight unit and a volume unit.

Can I enter a fraction?

Yes. Enter a decimal such as 0.5, a fraction such as 1/2, a mixed fraction such as 1 1/2, or a Unicode fraction such as ½. Blank, negative and zero-denominator inputs are rejected with a message.

Why does switching the cup system change the result?

US customary cups hold 236.5882365 ml. Metric and Australian cups hold 250 ml. The same amount therefore occupies a different number of cups, and Australian tablespoons (20 ml) differ from metric ones (15 ml).

Sources behind the numbers

Sources checked September 25, 2026. Ingredient values are recipe equivalents, not laboratory densities.