Ounces to mL Converter

Multiply U.S. fluid ounces by 29.5735 to get millilitres. Drink cans (12 fl oz ≈ 355 mL) and baby bottles are common examples.

How to use the Ounces to mL Converter

1. Type the number of US fluid ounces into the US fluid ounces field. Decimals such as 4 are fine.
2. Read the answer in Millilitres – it updates as you type, with no button to press.
3. To convert the other way, type into Millilitres and the US fluid ounces are recalculated.
4. Press Copy results to copy both values with the page title, or Copy link to share this exact conversion.

This page converts only US fl oz ⇄ mL. Need a different unit? Use the general volume converter, where you can choose any “from” and “to” unit.

How it works

Both units measure volume, so they are always in the same ratio: one US fluid ounce equals 29.57353 millilitres. The calculator multiplies the number of US fluid ounces you type by 29.57353 to give millilitres, and when you type into the millilitres field it divides by the same factor to give US fluid ounces. Because the ratio never changes, doubling the US fluid ounces always doubles the millilitres. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).

How to convert US fluid ounces to millilitres

1. Write down the value in US fluid ounces, for example 8 US fl oz.
2. Multiply by the conversion factor 29.57353 (because 1 US fluid ounce = 29.57353 mL).
3. 8 × 29.57353 = 236.58824 mL.
4. To go back from millilitres to US fluid ounces, divide by 29.57353 – or multiply by 0.033814023.

US fl oz to mL conversion table

What is a US fluid ounce?

The U.S. fluid ounce is 1/128 of a U.S. gallon, about 29.57 mL. It is a unit of volume: a fluid ounce of water weighs about one ounce, but other liquids do not.

What is a millilitre?

A millilitre is one thousandth of a litre and exactly one cubic centimetre. Medicines, cosmetics, drinks and kitchen measures are labelled in mL.

Quick mental conversion

For a fast estimate, multiply US fluid ounces by about 30 to get millilitres; the error is about 1.4%. Use the calculator above when you need the exact figure.

Common mistakes to avoid

Mixing u.s. and uk gallons, pints and fluid ounces, assuming a cup is always 250 ml, and treating volume and weight as interchangeable for anything except water.