Where do these numbers come from?
- NISTSP 811 exact unit definitions (1 in = 25.4 mm, 1 lb = 453.59237 g)current edition
- NISTHandbook 44, weights and measurescurrent edition
- King Arthur BakingIngredient Weight Chart (kitchen tools)retrieved Oct 23, 2026
Checked Oct 23, 2026. 1 US cup is exactly 236.5882365 mL (NIST SP 811), so 250 mL = 1.057 cups.



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2/3 cup = 10.67 tablespoons
How to measure it
2/3 × 16 = 10.667 tablespoons. Measure 10 tablespoons plus 2 teaspoons. That is also 32 teaspoons, 5.33 fluid ounces or 157.7 mL.
Frequently asked questions
How many teaspoons in 2/3 cup?
32 teaspoons.

