Convert US cups to US fluid ounces
Enter a value in US cups to convert it to US fluid ounces.
US cups to US fluid ounces reference
| US cups | US fluid ounces |
|---|---|
| 1 cup | 8.1154 fl oz |
| 2 cup | 16.2307 fl oz |
| 5 cup | 40.5769 fl oz |
| 10 cup | 81.1537 fl oz |
| 25 cup | 202.8843 fl oz |
| 50 cup | 405.7687 fl oz |
| 100 cup | 811.5374 fl oz |
The conversion factor
One US cup is 8.11537356 US fluid ounces. So to convert, multiply your figure in US cups by 8.11537356. To go the other way, multiply US fluid ounces by 0.12322292, or use the US fluid ounces to US cups converter.
Doing it in your head
For a quick estimate, round the factor: roughly "times 8". Use the exact converter above when the number matters.
Where this conversion comes up
Cooking and baking (especially US vs metric recipes), fuel, and container sizes.
See the common unit conversions cheat sheet for the factors worth memorising.
Related tools
Frequently asked questions
How many US fluid ounces are in a US cup?
1 US cup = 8.115374 US fluid ounces.
What is the formula to convert US cups to US fluid ounces?
Multiply the number of US cups by 8.11537356. To go back the other way, multiply US fluid ounces by 0.12322292.
What is 10 US cups in US fluid ounces?
10 US cups = 81.1537 US fluid ounces. The reference table below lists more common values.
Is this converter accurate?
It uses the internationally defined conversion factors and computes at full floating-point precision, then rounds only the displayed result. For everyday purposes it is exact; for legal, engineering or scientific work, confirm the required number of significant figures.
Does it work offline?
Yes. The conversion runs in your browser with no server call, so it keeps working with no connection, and nothing you enter is uploaded.
Last reviewed: September 2026. Figures and formulas are checked against their published sources; see the site's data notes.