How Do I Measure 2/3 Cups When I Don’t Have a Measuring Cup?
You can measure 2/3 cup by measuring out its equivalent in ounces (5 1/3), pints (1/3) and tablespoons (10 plus 2 teaspoons). If you do not have any measurement tools, then you can use the size of your fist to measure about one cup; cut that amount into thirds, and discard one third.
Consider equivalent measurements
The equivalent of 2/3 cup is 5 1/3 fluid ounces, 1/3 pint and 10 tablespoons plus 2 teaspoons. Knowing these equivalent measurements allows the use of other types of measuring devices, like a liquid measuring cup or measuring spoons.
Estimate based on known sizes
The size of your fist or a baseball is about one cup. You can estimate a measurement based on that size, cut it into thirds, and discard one third.
Look for package markings
Packages of ingredients, like butter and cream cheese, often include measurement markings. Simply cut the product along the marking for a perfect measurement.