How many ounces are in a cup?
Eight fluid ounces make a cup. Full ladder: 3 teaspoons in a tablespoon, 16 tablespoons in a cup, 2 cups in a pint, 4 cups in a quart, 16 cups in a gallon.
Now the trap: fluid ounces measure volume, plain ounces measure weight, and they only match for water and water-like liquids. A cup of all-purpose flour weighs about 4.25 ounces. A cup of honey weighs about 12. Recipes that fail mysteriously often fail right here, which is why serious bakers weigh ingredients in grams and skip the whole problem.
Also worth knowing: the UK cup and Australian cup differ slightly from the US cup, so international recipes deserve a second look before you commit butter to them.
8 fluid ounces in a cup. But fluid ounces measure volume and regular ounces measure weight, so a cup of flour weighs about 4.25 ounces, not 8. That mismatch ruins more recipes than anything else.
- NIST weights and measures
- King Arthur Baking ingredient weight chart
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https://frequentlyaskedquestions.us/q/how-many-ounces-in-a-cup/Everybody Asks. (2026, July 28). How many ounces are in a cup? https://frequentlyaskedquestions.us/q/how-many-ounces-in-a-cup/“How many ounces are in a cup?” Everybody Asks, 28 July 2026, https://frequentlyaskedquestions.us/q/how-many-ounces-in-a-cup/.“How many ounces are in a cup?” Everybody Asks. Last modified July 28, 2026. https://frequentlyaskedquestions.us/q/how-many-ounces-in-a-cup/.This page summarizes the primary sources listed above. For academic or encyclopedic work, cite those primary sources directly wherever possible.