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Exact relationship and formula
1 U.S. cup = 8 U.S. fluid ounces by volume. Fluid ounces = cups × 8.
Reverse mode applies the inverse relationship from the same definition.
Worked example
0.5 U.S. cup = 4 U.S. fluid ounces; 2 cups = 16 fluid ounces.
This is a volume conversion, not a mass conversion. A cup of flour and a cup of butter do not necessarily weigh the same number of ounces because ingredient density differs.
Common u.s. cups reference values
| U.S. cups | Conversion |
|---|---|
| 0.25 US cup | 2 US fl oz |
| 0.333333333333 US cup | 2.66666666667 US fl oz |
| 0.5 US cup | 4 US fl oz |
| 0.666666666667 US cup | 5.33333333333 US fl oz |
| 0.75 US cup | 6 US fl oz |
| 1 US cup | 8 US fl oz |
| 2 US cup | 16 US fl oz |
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