cup to fl oz converter
US cups to US fluid ounces conversions with the math shown
Converter
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1 cup = 8 fl oz
exact factor: 8
Popular cup to fl oz conversions
0.25 cup = 2 fl oz0.5 cup = 4 fl oz0.75 cup = 6 fl oz1 cup = 8 fl oz1.5 cup = 12 fl oz2 cup = 16 fl oz2.5 cup = 20 fl oz3 cup = 24 fl oz3.5 cup = 28 fl oz4 cup = 32 fl oz4.5 cup = 36 fl oz5 cup = 40 fl oz6 cup = 48 fl oz7 cup = 56 fl oz8 cup = 64 fl oz9 cup = 72 fl oz10 cup = 80 fl oz11 cup = 88 fl oz12 cup = 96 fl oz13 cup = 104 fl oz14 cup = 112 fl oz15 cup = 120 fl oz16 cup = 128 fl oz17 cup = 136 fl oz
How it works
Every cup→fl oz page multiplies by the exact factor 8. Definitions, not approximations — the same constants your reference handbook prints.
Frequently asked questions
How many US fluid ounces in 1 US cup?
Exactly 8 — multiply by 8. The factor is a unit definition, so the answer is exact.
Is the cup→fl oz conversion the same everywhere?
Yes — the factor is fixed by international definition or physical constant, so this site, your textbook and your calculator all agree. Only display rounding differs.
Do you store what I type?
No. The converter runs entirely in your browser — nothing is transmitted, logged or saved.
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