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What's 1/3 Cup Doubled?

August 7, 2025 by
Lewis Calvert

Cooking and baking often require adjusting recipe quantities to serve more people or to accommodate the ingredients you have on hand. One common adjustment is doubling measurements, which can sometimes create confusion, especially with fractions. In this comprehensive guide, we’ll answer the straightforward question: “What’s 1/3 cup doubled?” and provide helpful context for various cooking and baking scenarios where you might need this information.

The Quick Answer: 1/3 Cup Doubled

To double 1/3 cup, you get 2/3 cup.

This is calculated by multiplying 1/3 by 2: 1/3 × 2 = 2/3

While this may seem simple to some, understanding measurement conversions can be crucial for successful cooking and baking, especially when precision matters.

Understanding Cup Measurements in Cooking

Cup measurements are standard in many recipes, particularly in the United States. Understanding how they work and how to convert between them is an essential cooking skill.

The Standard Cup Measurement System

In the US customary system:

  • 1 cup equals 8 fluid ounces
  • 1 cup equals 16 tablespoons
  • 1 cup equals 48 teaspoons

Common Fraction Measurements in Recipes

Recipes frequently use fractional cup measurements:

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

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Converting 2/3 Cup to Other Measurements

When you’ve doubled 1/3 cup to get 2/3 cup, you might find it helpful to know equivalent measurements in other units.

Fluid Ounces and Milliliters

  • 2/3 cup = 5.33 fluid ounces
  • 2/3 cup = approximately 158 milliliters

Tablespoons and Teaspoons

  • 2/3 cup = 10 tablespoons + 2 teaspoons
  • 2/3 cup = 32 teaspoons

Visual References for 2/3 Cup

Sometimes it helps to have visual cues when measuring ingredients.

Using Measuring Cups

If you don’t have a 2/3 measuring cup, you can:

  • Fill a 1/3 cup twice
  • Fill a 1/4 cup twice, plus a generous 1 tablespoon + 1 teaspoon

Estimation Techniques

When precise measuring tools aren’t available, you can estimate 2/3 cup as:

  • Just over half of a standard coffee mug
  • About the size of a tennis ball in volume

Practical Applications in Recipes

Understanding how to double 1/3 cup is particularly useful in certain cooking scenarios.

Scaling Recipes Up or Down

When adjusting recipes:

  • Doubling: 1/3 cup → 2/3 cup
  • Tripling: 1/3 cup → 1 cup
  • Quadrupling: 1/3 cup → 1 1/3 cups
Original Recipe Doubled Tripled Quadrupled
1/3 cup 2/3 cup 1 cup 1 1/3 cups
1/2 cup 1 cup 1 1/2 cups 2 cups
1/4 cup 1/2 cup 3/4 cup 1 cup

Common Ingredients Often Measured in 1/3 or 2/3 Cups

Ingredients frequently measured in these amounts include:

  • Liquids: milk, water, oil
  • Dry ingredients: flour, sugar, rice
  • Semi-solids: yogurt, sour cream, peanut butter

The Importance of Accurate Measurements

Precision matters differently depending on what you’re cooking.

Baking vs. Cooking Precision

  • Baking: Requires precise measurements as it involves chemical reactions
  • Cooking: Often allows more flexibility and estimation

When Approximation is Acceptable

In some dishes, approximate measurements won’t significantly affect the outcome:

  • Soups and stews
  • Many vegetable dishes
  • Most meat marinades

Digital Tools for Measurement Conversion

Modern technology offers convenient solutions for measurement conversions.

Kitchen Apps and Online Converters

Numerous apps and websites can instantly convert between:

  • Different volume measurements
  • Weight and volume
  • Imperial and metric systems

Smart Kitchen Gadgets

Digital measuring cups and scales can:

  • Display multiple measurement units
  • Save conversion preferences
  • Calculate doubled or halved measurements automatically

Common Doubling Mistakes to Avoid

When doubling recipes, watch out for these common errors.

Not All Ingredients Scale Equally

Some ingredients shouldn’t be strictly doubled:

  • Spices and seasonings (often use 1.5× instead of 2×)
  • Leavening agents like baking powder (may need adjustment)
  • Cooking oils (may need less than double)

Volume vs. Weight Considerations

Remember that:

  • Volume doubling works for most liquids
  • Some ingredients are better measured by weight
  • Density variations can affect measurement accuracy

Conclusion

Doubling 1/3 cup gives you 2/3 cup, a simple but important conversion in cooking and baking. Whether you’re adjusting recipes to feed more people or working with the ingredients you have on hand, understanding these basic measurement relationships can help ensure your culinary creations turn out as intended.

Remember that while some cooking allows for approximation, baking typically requires more precision. When in doubt, using proper measuring tools will give you the most consistent results. And if you find yourself frequently adjusting recipes, consider investing in a complete set of measuring cups and spoons to make the process easier.

By mastering these simple conversions, you’ll gain more confidence in the kitchen and have greater flexibility when preparing your favorite recipes.