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Difference between Fluid Ounces and Ounces

Difference between Fluid Ounces and Ounces

In the culinary world, there are two types of ounces: fluid ounces and regular ounces. Many people use the terms interchangeably, but they actually have different meanings. This can cause confusion when recipes call for a certain number of ounces. Here’s a breakdown of how each type of ounce is used in cooking.

What are Fluid Ounces?

Fluid ounces are a units of measurement for volume. The fluid ounce is sometimes referred to simply as an “ounce” in applications where its use is implied, such as in barkeeping. It is distinct from the ounce avoirdupois, which is a unit of mass. Fluid ounces are very commonly used in the United States, both in recipes and as a unit of measure for serving sizes. Conversions between ounces and other units of measurement are relatively simple and straightforward. One fluid ounce is equivalent to about 0.0295735 liters or about 0.0676280454 imperial gallons. There are about 128 fluid ounces in one gallon. Fluid ounces can be abbreviated as fl oz, and are sometimes erroneously referred to as “fluid ounce force,” though this term is properly reserved for a different unit of measure.

What is Ounces?

Ounces are a unit of measurement that is typically used to measure weight. One ounce is equal to about 28.35 grams. Ounces can also be used to measure volume, though this is less common. One fluid ounce is equal to about 29.57 milliliters. When measuring weight, ounces are often abbreviated as “oz.” When measuring volume, they are usually abbreviated as “fl oz.” Ounces are part of the imperial system of measurements, which is used in the United States. The metric system, which is used in most other countries, uses the gram as its unit of measurement for weight and the liter as its unit of measurement for volume.

Difference between Fluid Ounces and Ounces

Fluid ounces and ounces are often used interchangeably, but they are actually two different units of measurement. A fluid ounce is a unit of measure for liquids, while an ounce is a unit of measure for solids. This can be confusing, especially since a fluid ounce is sometimes referred to as an “ounce” of liquid. To further complicate matters, there are also dry ounces and avoirdupois ounces. However, for the most part, when people refer to “ounces,” they are talking about avoirdupois ounces. This is the type of ounce that is used to weigh things like food and other objects.

So, when someone says they want “an ounce of coffee,” they are actually asking for 28.35 grams of coffee beans. If someone asks for “a fluid ounce of milk,” they are asking for 29.57 milliliters of milk. As you can see, it is important to be clear when referring to fluid ounces or ounces, as the two units of measure are not interchangeable.


While fluid ounces and ounces may seem like they are the same thing, there is a big difference between the two. Fluid ounces are used when measuring liquids while ounces are typically used when measuring solids. Make sure you are using the right measurement for your needs to avoid any confusion.

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