Ounces to Milliliters Converter

Created by Davide Borchia
Reviewed by Jack Bowater
Last updated: Jul 21, 2023

Ounces are standard measurement units for liquids; however, it may be helpful to know that quantity in milliliters: find it quickly with our ounces to milliliters converter.

Here you will learn:

  • What is a fluid ounce?
  • The different types of fluid ounces;
  • How to convert from fluid ounce to milliliters; and
  • How to use our fluid ounces to milliliters converter.

Keep reading! 🥛

What is a fluid ounce?

A fluid ounce, despite the name, is not a liquid but a measurement unit. Commonly used in the imperial system, it is particularly useful to indicate everyday quantities of liquids—being good where milliliters and liters are respectively too small or too big.

Ounces are abbreviated in fl oz, or fl. oz.. There are two widespread units with the same name, but they differ in their value:

  • The British Imperial fluid ounce; and
  • The United States Customary fluid ounce.

Be careful, and remember to be sure which one you are using!

⚠️ Remember not to mistake the fluid ounce with the ounce, the measurement unit of mass!

An imperial fluid ounce is defined in terms of the imperial gallon:

1 fl oz=1160 gal1\ \text{fl oz} = \frac{1}{160}\ \text{gal}

While the US fluid ounce is defined using the US liquid gallon:

1 fl oz=1128 gal1\ \text{fl oz} = \frac{1}{128}\ \text{gal}

Let's check how to convert from ounces to milliliters: jump with us to the metric system!

How do you convert ounces to milliliters?

We need two conversions for the two different types of fluid ounces.

The conversion for the imperial fluid ounces is:

1 fl oz=28.4 ml1\ \text{fl oz} = 28.4\ \text{ml}

While the US fluid ounces follows a slightly different conversion:

1 fl oz=29.6 ml1\ \text{fl oz} = 29.6\ \text{ml}

The difference between the two is slightly more than 4%4\%: in everyday life, it's not relevant—your cake will be delicious anyway. However, it is fundamental to be sure of the units you are working with when it comes to measurements that require better accuracy.

Misunderstanding on the topic caused, over the years, millions of dollars in damages!

How to use our ounces to milliliters converter

Our fluid ounces to milliliters converter is straightforward to use! Choose which one of the two units you desire to convert from and input the value. In the blink of an eye, we will give you the answer: as easy as drinking a glass of water. Or should we say, "As easy as drinking eight fluid ounces of water"? 😉


How to convert from fluid ounces to milliliters?

Depending on which units you are using, there are two conversions:

  • For the US fluid ounce, 1 fl oz = 29.6 ml; and
  • For the British fluid ounce, 1 fl oz = 28.4 ml.

How many milliliters are in an ounce?

There are 29.6 milliliters in a US fluid ounce, while 28.4 milliliters in a British fluid ounce. The difference dates back to 1824!

How many milliliters are 8 US fluid ounces?

The volume of a glass of water, which is 8 US fluid ounces, correspond to 237 ml. Some says you need 8 glasses of water a day: that's 64 ounces! Even if there is little scientific backing to that claim, remember to keep hydrated!

Davide Borchia
US fl oz
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