cups (US) to fluid ounces Converter
Type a value in cups (US) and get the answer in fluid ounces instantly — or convert the other way. The conversion uses the exact relationship 1 cups (US) = 8 fluid ounces, the same formula used in textbooks and engineering references.
The reverse of the classic: your recipe asks for 2 cups, the measuring jug only shows fluid ounces. One US cup is exactly 8 fluid ounces, so multiply by 8 — and stop doing it in your head while holding a whisk.
How to use
- Type your value into the cups (US) box — the fluid ounces result updates as you type.
- To go the other direction, type into the fluid ounces box instead and read the cups (US) result.
- Copy the result with one tap, or scan the reference table below for common values.
Frequently asked questions
How do you convert cups (US) to fluid ounces?
Multiply the number of cups (US) by 8. For example, 10 cups (US) = 80 fluid ounces. The converter above does this for you and shows more decimal places than you will ever need.
How many fluid ounces are in one cups (US)?
Exactly 8 fluid ounces. This is a fixed definition, not an approximation, so the conversion is exact at any scale.
Is this converter accurate for professional use?
Yes — it uses full double-precision arithmetic and the official cups (US)-to-fluid ounces factor, so results are reliable for schoolwork, cooking, fitness, travel and technical work.
Can I convert fluid ounces back to cups (US)?
Yes. The converter is two-way: just type in the second box and the first box updates instantly with the reverse conversion.