How Many Fluid Ounces in a Cup?
Quick Answer
There are 8 fluid ounces in a cup.
1 cup = 8 fl oz
Understanding the Conversion
One US cup equals exactly 8 US fluid ounces. This is a foundational cooking conversion — drink containers, recipe measurements, and kitchen measuring cups all use this relationship. Note: the UK cup is not standard; UK recipes usually use fluid ounces or milliliters.
Formula
1 cup = 8 fl oz
Common Examples
| Description | Value |
|---|---|
| A standard coffee mug | 8–12 fl oz (1–1.5 cups) |
| A can of soda (12 fl oz) | 1.5 cups |
| A pint glass | 16 fl oz (2 cups) |
Quick Reference Table
Use this table for quick conversions between cup and fluid ounces:
| cup | fluid ounces |
|---|---|
| 1 | 8 |
| 2 | 16 |
| 5 | 40 |
| 10 | 80 |
| 25 | 200 |
| 50 | 400 |
| 100 | 800 |
Frequently Asked Questions
How Many Fluid Ounces in a Cup?
There are 8 fluid ounces in a cup. One US cup equals exactly 8 US fluid ounces. This is a foundational cooking conversion — drink containers, recipe measurements, and kitchen measuring cups all use this relationship. Note: the UK cup is not standard; UK recipes usually use fluid ounces or milliliters.
What is the formula to convert cup to fluid ounces?
The formula is: 1 cup = 8 fl oz. To convert, multiply the number of cups by 8 to get the equivalent in fluid ounces.
How do I convert fluid ounces to cup?
To convert fluid ounces to cup, divide the number of fluid ounces by 8. For example, 40 fluid ounces equals 5 cups.