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Fluid Ounces vs. Ounces: What's the Difference?

Edited by Aimie Carlson || By Janet White || Published on February 12, 2024
Fluid ounces measure volume, primarily used for liquids, while ounces measure weight, used for solid and dry goods.

Key Differences

Fluid ounces are a unit of volume used to measure liquids, such as water, milk, or oil. On the other hand, ounces are a unit of weight, typically used to measure the weight of solid items, like sugar or flour.
In recipes, fluid ounces are used when specifying the volume of liquid ingredients. In contrast, ounces are used for dry ingredients where the weight is more relevant than the volume.
The measurement of fluid ounces is based on the space a liquid occupies, which can change with container shape but not with the liquid's weight. Ounces, as a weight measure, remain constant regardless of the substance's volume or container shape.
Fluid ounces are critical in industries like cooking and chemistry, where precise liquid volumes are essential. Ounces are more versatile, used in various contexts from postal services to grocery stores for weighing items.
The use of fluid ounces is often in the context of fluid dynamics and storage, considering factors like container capacity. Ounces, in the context of weight, consider aspects like load, balance, and distribution in packaging and transportation.

Comparison Chart

Measurement Type


Common Usage

Measuring liquids
Measuring solid and dry goods

Basis of Measurement

Space occupied by a liquid
Mass of an item

Industry Relevance

Cooking, chemistry
Postal services, grocery stores

Consideration in Use

Container capacity, fluid dynamics
Load, balance, distribution

Fluid Ounces and Ounces Definitions

Fluid Ounces

Fluid ounces indicate how much space a liquid will occupy.
This bottle holds 12 fluid ounces of water.


An ounce is a unit of weight used in various measurements.
The package weighed 32 ounces.

Fluid Ounces

A fluid ounce is a unit of volume for measuring liquids.
She poured eight fluid ounces of milk into the recipe.


Ounces are often used to measure the weight of dry goods.
She needed four ounces of flour for the cake.

Fluid Ounces

In fluid dynamics, fluid ounces measure the volume of a liquid.
He filled the radiator with 16 fluid ounces of coolant.


In postal services, ounces determine the weight of parcels.
The letter was just under one ounce and needed a standard stamp.

Fluid Ounces

Fluid ounces are used in recipes to specify liquid quantities.
The cocktail required two fluid ounces of lime juice.


Ounces are used in grocery stores for weighing produce and other items.
The apples cost $1.99 per ounce.

Fluid Ounces

Fluid ounces are essential for precision in liquid measurement.
The experiment required exactly 10 fluid ounces of the solution.


Ounces provide a measure for balancing and distributing weight.
The fishing lure weighed a few ounces for proper casting.


A unit of weight in the US Customary System, an avoirdupois unit equal to 437.5 grains (28.35 grams).


A unit of apothecary weight, equal to 480 grains (31.103 grams). See Table at measurement.


A fluid ounce. See Table at measurement.


A tiny bit
Not an ounce of sympathy.


See snow leopard.


Plural of ounce


What are ounces?

A unit of weight measurement.

Can you convert fluid ounces to ounces?

Not directly, as they measure different things (volume vs. weight).

Are fluid ounces the same in all countries?

No, the UK and US have slightly different measurements for fluid ounces.

Do ounces differ internationally?

An ounce in the metric system is a standardized weight unit.

Do postal services use ounces?

Yes, for weighing letters and parcels.

How many fluid ounces are in a cup?

8 fluid ounces in a US cup.

What are fluid ounces?

A unit of volume measurement for liquids.

Is a fluid ounce of water equal to an ounce in weight?

For water, approximately yes, but it's not true for all substances.

Do fluid ounces apply to all liquids?

Yes, they can measure any type of liquid.

Is ounce a common unit in grocery stores?

Yes, for products sold by weight.

How many ounces are in a pound?

16 ounces in one pound.

Are fluid ounces used in cooking?

Yes, primarily for measuring liquid ingredients.

Can I measure solid food in fluid ounces?

No, fluid ounces are for liquids; use weight ounces for solids.

How do I convert ounces to grams?

Multiply ounces by 28.35 to get grams.

Do recipes require precise fluid ounce measurements?

Yes, especially for baking and cocktails.

Is an ounce of feathers the same as an ounce of gold?

Yes, in weight, but their volume and density are different.

Are ounces used in scientific research?

Yes, but more precise measurements like grams are preferred.

Can fluid ounces be used for non-food liquids?

Yes, like in chemistry for liquid chemicals.

Do all liquids have the same weight per fluid ounce?

No, it varies based on the liquid's density.

Are ounces used in diet and nutrition?

Commonly for portion control and nutritional information.
About Author
Written by
Janet White
Janet White has been an esteemed writer and blogger for Difference Wiki. Holding a Master's degree in Science and Medical Journalism from the prestigious Boston University, she has consistently demonstrated her expertise and passion for her field. When she's not immersed in her work, Janet relishes her time exercising, delving into a good book, and cherishing moments with friends and family.
Edited by
Aimie Carlson
Aimie Carlson, holding a master's degree in English literature, is a fervent English language enthusiast. She lends her writing talents to Difference Wiki, a prominent website that specializes in comparisons, offering readers insightful analyses that both captivate and inform.

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