oz to Cups Converter

Created by Aleksandra Zając, MD
Reviewed by Dominik Czernia, PhD candidate and Jack Bowater
Last updated: Feb 19, 2022

If you ever wondered how much fluid ounces there are in 2 cups? Well, if that's the case, our Fl Oz to Cups converter is here for you. The converter will help proud home bakers to freely switch between recipes and from fluid ounces to cups.

Reading on, you'll find out how to use the fl oz to cups calculator and that - surprisingly - a cup doesn't always mean the same cup!

How to use fl oz to cups converter?

Using our fl oz to cups calculator is super easy and is always at hand just when you need it. Take a look at this short set of instructions explaining how to convert ounces to cups with our tool:

  1. Inspect the panel to your left.
  2. The default values show the conversion of one oz to 0.125 cups.
  3. Type in the number of fluid ounces that you want to calculate into cups (oz to cup conversion).
  4. Or, you can type the amount of cups you want to convert into fluid ounces (cup to oz conversion).
  5. Et voilà! You won't ever need to remember a cup volume or how to convert oz to cups anymore. 😀

An example: how to convert oz to cups?

Let's work with an example now and see how much is 2.5 fl oz to cups. Imagine you want to feed your 10 hungry friends with pancakes. 🥞 Using, for example, the pancake recipe calculator, you find out how many ingredients you need to give each person 5 delicious pancakes. The amount of milk you need to use is 2.5 cups. But you have no idea how much a cup is! 😶 No worries - this fl oz to cups converter has got you covered.

Using our tool is simple, so after typing the 2.5 cups into the calculator, you immediately know that you need 20 fluid ounces. That's how to measure oz in cups!

Fluid ounces to cups conversion chart

Using our fl oz to cups converter is not the only solution. If you need to calculate fluid ounces to cups (or the other way around) often, you might find it helpful to know this liquid oz to cups conversion chart.

Fluid ounces Cups
1 fl oz 0.125
2 fl oz 0.25
3 fl oz 0.375
4 fl oz 0.5
5 fl oz 0.625
6 fl oz 0.75
7 fl oz 0.875
8 fl oz 1
16 fl oz 2
40 fl oz 5

A cup volume doesn't equal cup volume!

It's a funny thing to discover that just as a pancake doesn't always equal a pancake - one cup might not mean one cup.

In the US, there are two main cup volumes used:

  • Legal cup - the measurement used in recipes, food labeling, and serving sizes. It is defined in the United States law as 240 mililiters. That's the one we use in fl oz to cups converter and in the above oz to cups conversion chart!
  • Customary cup - slightly different (contains 236 ml) than a legal cup, is equal to half of a liquid pint.

But you can also meet a coffee cup - this cup is way different since it contains only 118 ml. It is a measure of coffee made with 148 ml of water.

Outside of the United States, it is even more fun. We can differentiate many more cups and therefore many more conversions from liquid oz to cups:

  • Metric cup - is a little bigger than a legal cup and contains 250 ml.
  • United Kingdom cup - technically, half of an imperial pint, about 284.13 ml (one imperial pint = 568.26 ml).
  • Japanese cup - legally equated with 2401/13310 litres, means 200 ml and is still used to describe amounts of rice and sake, the traditional alcoholic beverage.


How much fl oz is 3 cups?

3 cups equals 24 fl oz. If you want to convert cups to fluid ounces, you need to multiply cups by 8. Here is how we count that step by step:

  1. 1 cup = 8 fl oz
  2. 3 cups = 3 × 8 fl oz
  3. 3 × 8 fl oz = 24 fl oz.

How to convert fl oz to cups?

To convert fluid ounces to cups, you need to divide fluid ounces by 8.
For example:

  • 4 fluid ounces = 0.5 cup
  • 8 fluid ounces = 1 cup
  • 10 fluid ounces = 1.25 cup
  • 16 fluid ounces = 2 cups
  • 20 fluid ounces = 2.5 cups

How to convert cups to fl oz?

To convert cups to fluid ounces, you need to multiply cups by 8. Let's see some examples:

  • 1 cup = 8 fluid ounces
  • 2 cups = 2 × 8 = 16 fluid ounces
  • 3 cups = 3 × 8 = 24 fluid ounces
  • 0.5 cup = 0.5 × 8 = 4 fluid ounces
  • 2.5 cup = 2.5 × 8 = 10 fluid ounces

How many fl oz are in a cup?

In one cup, there are 8 fluid ounces. Therefore:

  • in 2 cups there are 16 fluid ounces;
  • in 3 cups there are 24 fluid ounces;
  • in 4 cups there are 32 fluid ounces;
  • in 0.5 cup there are 4 fluid ounces;
  • in 0.25 of a cup there are 2 fluid ounces; and
  • 0.125 of a cup equals exactly one fluid ounce.

How much is 6 oz to a cup?

To find cups, you need to divide fluid ounces by 8, because one cup contains exactly 8 fluid ounces. Let's count it step by step:

  1. 1 cup = 8 fluid ounces,
  2. We divide our fluid ounces, 6, by 8 to find, how many cups are there.
  3. 6/8 = 3/4 of a cup.
  4. 6 fluid ounces = 3/4 of a cup.
Aleksandra Zając, MD
Fluid ounce (fl oz)
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