Convert oz to ml

1 fl oz = 29.5735 ml: formula and example

To convert oz to ml, multiply US fluid ounces by 29.5735295625: ml = fl oz × 29.5735. Example: a 20 oz soda bottle holds 20 × 29.5735 = 591.47 ml, a little under 0.6 liter.

This page is about fluid ounces, a unit of volume. The ounce on a kitchen or postal scale is a unit of weight worth 28.35 g; for that one, use the site's ounces to grams conversion. On a label, "fl oz" always means volume, while a plain "oz" can mean either.

The converter on this page is already set to "US fluid ounce (US fl oz)" to "milliliter (ml)". The answer updates as you type, to six significant figures (20 US fl oz = 591.471 ml), and the "Formula:" line reads 1 US fl oz = 29.5735295625 ml. The ⇄ "Swap units" button converts ml back to ounces, and the "In every unit" table shows the same amount in cups, tablespoons and liters. The UK fluid ounce, 28.4130625 ml, is not in the lists: multiply by hand for British recipes.

oz to ml conversion chart

Everyday uses

Baby bottles

Most bottles are marked in both ounces and milliliters. A 9 oz bottle holds 266 ml, and the 4 oz line sits at 118 ml. If formula instructions abroad give milliliters, read the ml scale instead of converting.

Toiletries and carry-on liquids

Labels round both ways: 50 ml is 1.69 fl oz, printed as 1.7 fl oz, and 100 ml is 3.38 fl oz, printed as 3.4 fl oz. That is why the airport liquids rule reads "3.4 oz (100 ml)".

Cocktails and drinks

A 1.5 oz shot is 44.36 ml, close to the 40 or 50 ml measures used in Europe. A British pint is 20 UK fluid ounces, or 568.26 ml, while a US pint glass holds 16 US fluid ounces, 473.18 ml.

Frequently asked questions

How many ml are in 1 oz?

29.57 ml in a US fluid ounce and 28.41 ml in a UK fluid ounce.

Is a fluid ounce the same as an ounce?

No. A fluid ounce measures volume, an ounce measures weight. One US fluid ounce of water weighs roughly 29.5 g, not 28.35 g.

How many ounces are in a liter?

33.81 US fluid ounces, or 35.20 UK fluid ounces.