Fluid Ounces to Milliliters Converter

About the fl oz to ml calculation

One fluid ounce is exactly 29.5735 milliliters, so converting between them is a single multiplication. Enter any value above and the result updates as you type. The US fluid ounce. Measures volume, not weight — quite separate from the ounce. The everyday unit for drinks, medicine doses and recipe liquids.

Formula

ml = fl oz × 29.5735

1 fl oz = 29.5735 ml
1 ml = 0.033814 fl oz

Worked example

To convert 8 fl oz, multiply by 29.5735: 8 × 29.5735 = 236.588 ml.

Frequently asked questions

How many milliliters are in a fluid ounce?

There are 29.5735 milliliters in one fluid ounce. To convert any amount, multiply the number of fluid ounces by 29.5735.

How do I convert milliliters back to fluid ounces?

Divide instead of multiplying, or equivalently multiply by 0.033814. One milliliter is 0.033814 fluid ounces.

Is this conversion exact?

Yes. Since the international agreement of 1959, the relationship between fluid ounces and milliliters is defined exactly rather than measured, so the only rounding here is in how many decimal places we show.

Where is each of these units used?

Fluid Ounces: the US fluid ounce. Measures volume, not weight — quite separate from the ounce. Milliliters: the everyday unit for drinks, medicine doses and recipe liquids.

Sources

• NIST Special Publication 811 — Guide for the Use of the International System of Units