How many 2/3 cups make up a cup?

This is a common question for bakers and cooks when scaling recipes up or down. Knowing the relationship between different fractional cup measurements allows you to easily convert between them.

The Quick Answer

The quick answer is that three 2/3 cups make up one standard 1 cup measuring cup. Each 2/3 cup measurement is equal to around 6.67 fluid ounces. Since there are 16 fluid ounces in 1 cup, three of the 2/3 cup measurements are needed to equal a full 1 cup measurement.

Understanding Cup Measurements

When measuring ingredients for baking and cooking recipes, standard cup measurements are often used. A standard US cup is defined as 8 fluid ounces. There are 16 fluid ounces total in 1 cup.

Cup measurements can be broken down into fractions, with the most common being:

  • 1/4 cup
  • 1/3 cup
  • 1/2 cup
  • 2/3 cup

Since there are 16 total ounces in a full cup, each fractional cup measurement equals that fraction out of the 16 total ounces:

  • 1/4 cup = 4 fluid ounces (one fourth of 16 fluid ounces)
  • 1/3 cup = 5 1/3 fluid ounces
  • 1/2 cup = 8 fluid ounces
  • 2/3 cup = 10 2/3 fluid ounces (two thirds of 16 fluid ounces)

2/3 Cup Measurement

Looking specifically at the 2/3 cup measurement, it equals 10 2/3 fluid ounces, or approximately 6.67 ounces. This means that three 2/3 cup measurements would equal right around 20 fluid ounces, or 1 1/4 cups.

Since a standard US cup is defined as exactly 16 fluid ounces, three 2/3 cup measurements don’t perfectly equal 1 cup. But at 20 fluid ounces total, they are close enough for most practical baking and cooking purposes.

Converting Between 2/3 Cup and 1 Cup

So when converting between 2/3 cup and 1 cup measurements:

  • 3 2/3 cups is approximately equal to 1 cup
  • 1 cup is approximately equal to 3 2/3 cups

You can use this conversion to easily scale recipes up or down. For example, if a recipe calls for 2 cups of flour and you want to halve it, you would use 3 2/3 cups of flour instead.

Example Conversions

Here are some examples of converting between 2/3 cup and 1 cup measurements:

  • A recipe needs 1 1/2 cups of sugar. To convert to 2/3 cups, multiply by 3:
    • 1 1/2 cups x 3 = 4 1/2 2/3 cups
  • A recipe calls for 4 2/3 cups of milk. To convert to cups, divide by 3:
    • 4 2/3 cups / 3 = Approximately 1 1/2 cups

Tips for Measuring 2/3 Cup Accurately

When measuring out 2/3 cup, keep these tips in mind for accuracy:

  • Use a clear liquid measuring cup with fraction markings
  • Fill to slightly below the 2/3 cup line, then look at eye level to check the accuracy
  • Use the right tool – a 2/3 cup dry measuring cup or a 2/3 cup measuring spoon
  • Level off the top surface of the ingredient
  • Avoid packing or compressing the ingredient into the cup


In summary, three 2/3 cup measurements equal approximately 1 standard US cup measurement. Each 2/3 cup equals around 6.67 fluid ounces, while a full cup is 16 fluid ounces. This 3:1 ratio allows you to easily convert between 2/3 cups and cups when following recipes.

Knowing the relationship between 2/3 cup and 1 cup measurements is helpful for bakers, cooks, and anyone who follows recipes with fractional volumes. With some simple math you can scale the ingredient amounts up or down as needed.

Next time you need to convert 2/3 cups to cups, remember that 3 2/3 cups make 1 cup. Measuring accurately and using the right conversion will lead to baking success.

Here is a summary table:

Fractional Cup Measurement Fluid Ounces
1/4 cup 4 ounces
1/3 cup 5 1/3 ounces
1/2 cup 8 ounces
2/3 cup 10 2/3 ounces
1 cup 16 ounces

This table shows the fluid ounce equivalents for common fractional cup measurements. As you can see, three 2/3 cup measurements at 10 2/3 ounces each equals approximately 1 cup at 16 fluid ounces.

Using this information, converting between any cup measurement fraction and cups is straightforward. Just remember that there are 16 total ounces in 1 complete cup.

Baking can require high accuracy and precision, so be sure to carefully measure all ingredients using proper technique. But you can relax when scaling recipes up or down, knowing exactly how 2/3 cups convert to cups.

With the right tools and measurement knowledge, your recipes will turn out perfectly every time. Cup conversion doesn’t have to be complicated. Stick to the simple ratio of 3:1 when going between 2/3 cups and cups.

Now that you understand how many 2/3 cups are in a cup, you can adapt any recipe to feed just a few or a whole crowd. Cooking and baking is more fun when you feel confident about scaling ingredient amounts.

So the next time you need to know how many 2/3 cup measurements make a complete cup, you’ve got the answer – three. Keep this handy conversion trick in mind for all your kitchen endeavors.

Cups, with their fractions, can seem tricky when you’re new to cooking and baking. But understanding the relationship between different measurements is the key. Don’t let converting between 2/3 cups and cups slow you down.

No matter what recipes you’re trying, you can easily halve, double, or triple them with simple math. Use your knowledge of 3 2/3 cups in 1 cup for seamless scaling.

Now put this tips into practice in your own kitchen. Bake a batch of cookies and only use half the dough. Or triple a dinner recipe to feed extra guests. Cup conversion gives you flexibility.

Don’t forget this formula: 3 2/3 cups = 1 cup. With this key piece of kitchen math memorized, you’ll gain confidence in adapting any recipe you follow.

Understanding conversions is a fundamental cooking skill. Mastery of cup measurements like 2/3 cups and their ratios arms you with knowledge to succeed in the kitchen.

So be bold, get creative, and make each recipe your own – the possibilities are endless when you know your cups. Cooking is more rewarding when you understand the numbers and can tweak them to suit your needs.

Now that you know precisely how 2/3 cups convert to regular cups, you can scale up or down for baking, cooking, and more. This handy trick is essential for every chef.

Equipped with this knowledge, you can double, halve, or otherwise adapt any recipe with confidence and ease. No more hesitation or uncertainty when it comes to cups!


What is the conversion from 2/3 cup to 1 cup?

The conversion from 2/3 cup to 1 cup is: 3 2/3 cups = 1 cup. Each 2/3 cup measurement equals around 6.67 fluid ounces, and there are 16 fluid ounces in a standard 1 cup measure.

Is 2/3 cup half of 1 cup?

No, 2/3 cup is not half of 1 cup. Half of 1 cup is 1/2 cup, which equals 8 fluid ounces. 2/3 cup is slightly more than half at around 6.67 ounces.

How many ounces are in 2/3 cup?

There are approximately 6.67 fluid ounces in a 2/3 cup measurement.

Can I use 3/4 cup instead of 2/3 cup?

You can substitute 3/4 cup for 2/3 cup, but be aware it will change the ratio slightly. The resulting recipe may have a slightly different consistency with a 3/4 cup substitution.

What are some examples of 2/3 cup measurements?

Some examples of ingredients that are commonly measured in 2/3 cup amounts include:

  • Flour
  • Sugar
  • Butter or oil
  • Milk
  • Chopped nuts
  • Chocolate chips
  • Dried fruit

Many baking recipes call for ingredients in 2/3 cup increments. It’s a handy middle ground between 1/2 cup and 1 cup.

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