US Fluid Ounces to US Cups
Convert us fluid ounces to us cups instantly. 1 fl oz = 0.125 cup. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert us fluid ounces to us cups
To convert us fluid ounces to us cups, divide by 8 (multiply by 0.125). The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
cup = fl oz × 0.125
US Fluid Ounces to US Cups conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| US Fluid Ounces | US Cups |
|---|---|
| 1 fl oz | 0.125 cup |
| 2 fl oz | 0.25 cup |
| 3 fl oz | 0.375 cup |
| 5 fl oz | 0.625 cup |
| 10 fl oz | 1.25 cup |
| 20 fl oz | 2.5 cup |
| 25 fl oz | 3.125 cup |
| 50 fl oz | 6.25 cup |
| 100 fl oz | 12.5 cup |
| 500 fl oz | 62.5 cup |
| 1,000 fl oz | 125 cup |
What is a us fluid ounce?
A sixteenth of a US pint, about 29.6 mL.
What is a us cup?
8 US fluid ounces. The standard American recipe measure.
The formula
cup = fl oz × 0.125
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the US Fluid Ounces to US Cups
- Type the number of us fluid ounces you want to convert.
- Read the result in us cups straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked us cups to us fluid ounces page.
US Fluid Ounces to US Cups — frequently asked questions
How many us cups are in a us fluid ounce?
One us fluid ounce equals 0.125 cup. cup = fl oz × 0.125
What is the formula to convert us fluid ounces to us cups?
The formula is cup = fl oz × 0.125. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert us cups back to us fluid ounces?
Divide instead of multiplying: one us cup is 8 fl oz. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this us fluid ounces to us cups free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 15, 2026 · Calculation runs client-side · No data collected · Report an error