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Difference Between Fluid Ounces And Ounces

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The main difference between fluid ounces and ounces is that fluid ounces are volume measurements, while ounces are weight measurements. In this article, we will explain the difference in more detail and provide some examples so that you can be sure you are using the right measurement for your needs.

What is a Fluid Ounce?

fluid ounce
An example of a 2 Fluid Ounce (fl oz) Tabasco sauce (approximately 59 mL)

A fluid ounce is a unit of volume measurement. It is equal to about 29.57 mL, or just under 30 mL. You can use fluid ounces to measure liquids like water, milk, and juice. When measuring smaller amounts, you might see fluid ounces abbreviated as fl oz.

You can measure the amount of liquid in an object usually by using a measuring cup or beaker to determine how many fluid ounces are inside it. Fluid ounces can also be used as part of other units like cups and pints for larger measures of liquids.

What is an Ounce?

ounce of gold
The Ounce is today an international reference for the measurement of precious metals such as gold, silver or precious stones

Ounces are a unit of weight, and they measure the heaviness of an object. The most common ounce measurements in use today are the avoirdupois ounce and troy ounce. Troy ounces are used to weigh precious metals like gold and silver, while avoirdupois ounces are used for everything else.

Ounces are weight measurements that compare various objects against each other rather than their volumes (as per fluid ounce). You might see them listed under their abbreviations ozs which stand for 'ounces' too!

Ounces are a unit of measurement in the Imperial system and US customary units. As weight measurements, they are used to determine how heavy an object is, e.g., how many ounces does this rock weigh? The answer would give you a number like 16oz or 32oz (ounces).

Differences Between Fluid Ounces and Ounces

Difference in measurement

The biggest difference between fluid ounces and ounces is that fluid ounces are a unit of volume while ounces are a unit of weight. This means that they cannot be directly converted to each other without also knowing the density of the object being measured. Despite similar names, the things they are used to measure are completely different.

The difference in uses

Fluid ounces and regular ounces can both be used for a variety of purposes. Fluid ounces are most commonly used in the kitchen when measuring out liquids like water, milk, and juice, while regular ounces are more often seen on scales measuring the weight of food or other objects.

You might also use fluid ounces when creating a recipe that requires a specific amount of liquid ingredients, such as two cups of milk or one pint of cream. On the other hand, if you were trying to figure out how much a book weighed in order to calculate shipping costs, you would be using regular ounces instead.

Comparison Chart: Fluid Ounces Vs Ounces

ParametersFluid OuncesOunces
Symbolfl oz.oz.
Used forLiquidSolid
MeasuresVolume of a liquidWeight of a solid object
ExamplesWater, Soft drinks, etc.Gold, Silver, etc.
Has subcategoriesNoYes

Similarities Between Fluid Ounces & Ounces

Despite the fact that these two measurements are quite different, there are some similarities between them as well.

Both use the same system of measurement

For starters, they are both units of measurement used in the imperial system. This means that they can be easily converted to other units within this system (such as teaspoons, tablespoons, and cups for fluid ounces or pounds and stones for regular ounces).

Additionally, both types of ounces can be abbreviated using the letters “oz”. However, if you see “fl oz” this is always referring to a fluid ounce measurement while just “oz” by itself is referring to a regular ounce measurement.

Both measure weight or volume

While one is a unit of weight and the other is a unit of volume, both fluid ounces, and regular ounces can be used to measure the same things.

For example, you could use either type of ounce to measure how much water you’re drinking in a day or how much your pet weighs. The only difference is that the conversion rate between them will not be equal.

This means that if you’re trying to figure out how much something weighs in ounces, it’s best to use regular ounces (oz), and if you want to know how much liquid something holds, it’s better to use fluid ounces (fl oz).


Is 1 oz liquid the same as 1 oz weight?

No, they are not the same. One fluid ounce in water weight is more than an ounce in weight.

How do you convert fluid ounces to regular ounces?

You can't directly convert between the two without also knowing the density of the object being measured. However, you can easily find conversion charts online that will do this for you.

Do all countries use fluid ounces?

No, not all countries use fluid ounces. In fact, many countries use the metric system, which uses different units of measurement altogether.

Can we use both interchangeably?

While you can use both fluid ounces and regular ounces to measure things, it’s important to be aware that they are not interchangeable. This is because one is a unit of weight while the other is a unit of volume.

This also means that if you try to convert between them without knowing the density of the object being measured, the conversion will not be accurate.

So, while you can use both fluid ounces and regular ounces to measure weight or volume, it’s important to be aware of the differences between them and to always use the appropriate unit of measurement for the task at hand.


So, what’s the bottom line? Fluid ounces and ounces are two different measurements with different purposes. When measuring volume, use fluid ounces. When measuring weight or mass, use ounces. Hopefully, this clears up any confusion about these terms – now you can be sure to measure correctly next time! Be careful not to confuse them when working with recipes or other measurements.


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About the Author: Nicolas Seignette

Nicolas Seignette, who holds a scientific baccalaureate, began his studies in mathematics and computer science applied to human and social sciences (MIASHS). He then continued his university studies with a DEUST WMI (Webmaster and Internet professions) at the University of Limoges before finishing his course with a professional license specialized in the IT professions. On 10Differences, he is in charge of the research and the writing of the articles concerning technology, sciences and mathematics.
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