How Many Ounces In A Cup?

Cooking at home can be fun. And surrounding yourself with pretty cookbooks or gorgeous food blogs are just beautiful. But sometimes, an issue arises when the measurement isn’t equal to what you get used to. Maybe you’re familiar with the imperial measurement and the recipe calls for something from the metric world or vice versa.

Are you currently trying to convert between ounces into a cup of liquid?

Fear not, in this blog post you can find the answer of how many ounces in a cup!

Helpful tools for measuring ingredients

If you don’t like estimating or calculating, simply use these helpful tools to help you figure out how many amounts of the ingredients you need for the recipe.

  • Measuring cups (for dry ingredients). This stackable set of measuring cups can help you scoop those all-purpose flour, icing sugar, granulated white sugar, etc.
  • Clear measuring cups (for liquid ingredients). I love clear measuring cups SO MUCH simply because I love ergonomic things that is positively correlated to science or evidenced to be accurate. These Pyrex cups are microwave-friendly BTW so you can use it to heat up your milk after measuring it.
  • Measuring spoons. This pack of spoons are used for measuring little amount of ingredients such as baking powder, baking soda, or yeast.
  • Digital kitchen scale. Last but definitely not the least, don’t forget to invest in a digital kitchen scale. It helps you get rid of headache due to those metric measurements of ingredients such as “300 grams of cornstarch”.

How many ounces in a cup?

The short answer is 8 (1 cup=8 oz fluid). But actually, the answer shouldn’t be straightforward because it depends on what you measure.

A cup of water has a different weight from a cup of dry rice. When measuring a matter, there are at least two different types of quantity you can pick from: the volume and the mass.

Mass is one of those fundamental physical quantities that in everyday conversation related to “weight”. Ounces (Oz) is an example of a mass unit.

Volume is a derivative physical quantity that represents the amount of closed 3-dimensional space of a matter. Cup is an example of a volume unit in the British Imperial and US Customary system of measurement.

As you can see, oz and cup come from two different worlds.

And, BTW, there is another thing called DENSITY. Different ingredients have different densities. 1 cup of flour (volume) weighs differently with 1 cup of chocolate chips, even though both of them are categorized as “dry” ingredients. Things get a little bit more complex when you compare dry and liquid ingredients.

Dry vs liquid measurement

When we’re measuring liquid in cooking, usually, we’re talking about the VOLUME instead of the mass.

This conversion cannot be easily applied to dry matter such as pasta, grain, or chocolate chips. This is because each product has a different mass-to-volume ratio, and you cannot simply convert a volume unit to a mass unit.

So, what should you do when you want to convert oz-to-cup or cup-to-oz for dry ingredients? The safest answer is: use a kitchen scale.

That being said, there are some popular ingredients that people have measured before and publish the result on the internet so you can find it out without investing on a kitchen scale.

Fluid Measurement Conversion Table (Cup to Oz)

Oh, and by the way, if you have a liquid ingredient and you want to convert between cup and ounces, check out this table:

CupFluid Oz (fluid ounces)
Cup to Oz conversion

So, how many ounces in a cup of common ingredients?

Now you know that converting an ounce into a cup will produce different results for different ingredients. The answer is based on what you measure. However, if you insist, here are quick answers for oz-to-cup conversion for very common ingredients.

How many ounces in a cup of water?

1 cup of water equal to 8 ounces.

How many ounces in a cup of coffee?

1 cup of brewed coffee (liquid) equal to 6 ounces.

How many ounces in a cup of flour?

1 cup of flour is equal to 4 1/4 ounces (oz). Please keep in mind that flour here is a dry matter.

How many ounces in a cup of butter?

1 cup of butter equals 8 ounces

How many ounces in a cup of rice?

1 cup of UNCOOKED rice almost equals ~6 1/2 ounces while 1 cup of COOKED rice almost equals ~8 3/4 ounces.