Ounces to mL Converter

Convert US fluid ounces (fl oz) to milliliters (mL), or convert milliliters back to fluid ounces. Enter a value in either field and the other unit updates automatically.

Conversion reference: U.S. National Institute of Standards and Technology (NIST). U.S. food labeling may use rounded household metric equivalents, such as 30 mL per fluid ounce.

Use this ounces to mL converter to convert U.S. fluid ounces (fl oz) to milliliters (mL) or milliliters back to fluid ounces. It is useful for water bottles, coffee cups, beverages, recipes, cosmetics, medicine, and other liquid measurements.

1 U.S. fluid ounce equals approximately 29.57353 mL. This calculator uses U.S. fluid ounces, not Imperial fluid ounces.

How many mL are in an ounce?

There are approximately 29.57353 milliliters in 1 U.S. fluid ounce. For everyday measurements, this is often rounded to 29.57 mL.

1\ \mathrm{US\ fl\ oz} = 29.57353\ \mathrm{mL}

Ounces to mL formula

To convert fluid ounces to milliliters, multiply the number of U.S. fluid ounces by 29.57353.

\mathrm{mL} = \mathrm{fl\ oz} \times 29.57353

For example, to convert 12 oz to mL:

12\ \mathrm{fl\ oz} \times 29.57353 = 354.88\ \mathrm{mL}

Therefore, 12 U.S. fl oz is approximately 354.88 mL, commonly rounded to about 355 mL.

mL to ounces formula

To convert milliliters to U.S. fluid ounces, divide the number of milliliters by 29.57353.

\mathrm{fl\ oz} = \frac{\mathrm{mL}}{29.57353}

For example, to convert 500 mL to oz:

\frac{500\ \mathrm{mL}}{29.57353} \approx 16.91\ \mathrm{fl\ oz}

Common ounces to mL conversion chart

The table below shows common oz to mL conversions for U.S. fluid ounces.

US fl oz	Milliliters

1 fl oz	29.57 mL
2 fl oz	59.15 mL
4 fl oz	118.29 mL
8 fl oz	236.59 mL
12 fl oz	354.88 mL
16 fl oz	473.18 mL
20 fl oz	591.47 mL
24 fl oz	709.76 mL
32 fl oz	946.35 mL
64 fl oz	1,892.71 mL

1 oz to mL: 29.57 mL
8 oz to mL: 236.59 mL
12 oz to mL: 354.88 mL
16 oz to mL: 473.18 mL
20 oz to mL: 591.47 mL
24 oz to mL: 709.76 mL
32 oz to mL: 946.35 mL

Fluid ounces vs. ounces: what is the difference?

A fluid ounce (fl oz) measures volume, while an ounce (oz) usually measures weight or mass.

This calculator converts liquid volume only. You cannot directly convert ounces by weight to milliliters unless you also know the density of the ingredient or material.

Volume

1\ \mathrm{US\ fl\ oz} \approx 29.57353\ \mathrm{mL}

Weight

1\ \mathrm{oz} \approx 28.35\ \mathrm{g}

U.S. fluid ounces vs. Imperial fluid ounces

U.S. fluid ounces and Imperial fluid ounces are different units. This calculator uses the U.S. fluid ounce, which is normally used for liquid measurements in the United States.

1 U.S. fl oz: $\approx 29.57353\ \mathrm{mL}$
1 Imperial fl oz: $\approx 28.41306\ \mathrm{mL}$

The difference is relatively small for 1 fluid ounce, but it becomes more noticeable with larger quantities. Check whether a recipe or product uses U.S. or Imperial fluid ounces before converting.

Why does 1 fl oz sometimes equal 30 mL?

You may see 1 fl oz = 30 mL on U.S. food labels, nutrition labels, measuring cups, or product packaging. This is a convenient rounded value.

For unit conversion, this calculator uses the more precise 1 U.S. fl oz ≈ 29.57353 mL conversion.

Ounces to mL FAQ

Q. How many mL are in 1 oz?
A. If you mean a U.S. fluid ounce, 1 fl oz is approximately 29.57 mL.
Q. How many mL is 8 oz?
A. 8 U.S. fl oz is approximately 236.59 mL.
Q. How many mL is 12 oz?
A. 12 U.S. fl oz is approximately 354.88 mL, commonly rounded to about 355 mL.
Q. How many mL is 16 oz?
A. 16 U.S. fl oz is approximately 473.18 mL.
Q. How many mL is 20 oz?
A. 20 U.S. fl oz is approximately 591.47 mL.
Q. How many mL is 32 oz?
A. 32 U.S. fl oz is approximately 946.35 mL.
Q. How many ounces is 100 mL?
A. 100 mL is approximately 3.38 U.S. fl oz.
Q. How many ounces is 250 mL?
A. 250 mL is approximately 8.45 U.S. fl oz.
Q. How many ounces is 500 mL?
A. 500 mL is approximately 16.91 U.S. fl oz.
Q. Is oz the same as fl oz?
A. No. fl oz measures liquid volume, while oz usually measures weight. This calculator converts U.S. fluid ounces and milliliters.

🥤 Ounces to mL Converter