US cups to US fluid ounces Formula
US fluid ounces = US cups × 8
One US cup is 8 US fluid ounces, by definition, so the conversion is exact. For example, 2 US cup × 8 = 16 US fl oz.
Cups to Fluid Ounces (cups to fl oz) Converter
Enter US cups to get US fluid ounces.
1 US cup = 8 US fl oz
From
To
8
Try:
Step-by-stepUS cup → US fl oz
11 US cup = 8 US fl ozformula
21 × 8substitute
38 US fl ozresult
Fractional Cups in Fluid Ounces
| Measure | US fl oz |
|---|---|
| 1/4 cup | 2 |
| 1/3 cup | 2.67 |
| 1/2 cup | 4 |
| 2/3 cup | 5.33 |
| 3/4 cup | 6 |
| 1 cup | 8 |
A Metric Cup Is Not 8 Ounces
A 250 ml metric cup is 8.45 US fluid ounces. If a recipe from outside the US says 1 cup, check whether it means 250 ml before converting to ounces.
US cups to US fluid ounces Table
| US cups | US fluid ounces (US fl oz) |
|---|---|
| 0.125 US cup | 1 US fl oz |
| 0.25 US cup | 2 US fl oz |
| 0.3333 US cup | 2.6667 US fl oz |
| 0.5 US cup | 4 US fl oz |
| 0.6667 US cup | 5.3333 US fl oz |
| 0.75 US cup | 6 US fl oz |
| 1 US cup | 8 US fl oz |
| 1.5 US cup | 12 US fl oz |
| 2 US cup | 16 US fl oz |
| 2.5 US cup | 20 US fl oz |
| 3 US cup | 24 US fl oz |
| 4 US cup | 32 US fl oz |
| 6 US cup | 48 US fl oz |
| 8 US cup | 64 US fl oz |
| 16 US cup | 128 US fl oz |
Common Questions
How many ounces are in a cup?
8 US fluid ounces.
How many fl oz is 1/3 cup?
1/3 cup is about 2.67 fl oz (2 2/3 fl oz).
How many ounces is 3/4 cup?
3/4 cup is 6 fluid ounces.
Is a cup 8 ounces by weight?
No. A cup is 8 fluid ounces of volume. A cup of flour weighs about 4.5 oz; a cup of water weighs about 8.3 oz.
Related Volume Converters
US fluid ounces to US cups→US cups to Milliliters→Milliliters to US cups→US fluid ounces to Milliliters→Milliliters to US fluid ounces→US cups to Tablespoons→All Volume Converters→
Reference: NIST Handbook 44, Appendix C: General Tables of Units of Measurement (US units); UK Weights and Measures Act 1985 (imperial units).