2/3 cup can be measured using its equivalency in ounces (5 1/3), pints (1/3) and tablespoons (10 plus 2 teaspoons). If you do not have any measuring instruments, you can approximate one cup using the size of your fist; divide this amount into thirds and discard one third.
Consider similar measures
5 1/3 fluid ounces, 1/3 pint, 10 tablespoons plus 2 teaspoons correspond to 2/3 cup. Having knowledge of these equivalent measurements permits the use of various measuring instruments, such as a liquid measuring cup or measuring spoons.
Calculate based on known dimensions
The size of your fist or a baseball is roughly equivalent to one cup. On the basis of this size, you can estimate a measurement, divide it into thirds, and eliminate one third.
Look for package markings
Ingredients like as butter and cream cheese are frequently packaged with measuring indications. Simply cut following the markings for a precise measurement.