How it's calculated
fl oz = cups × 8
US: 1 cup = 8 fl oz (selectable standard). Reverse: cups = fl oz ÷ 8.
Common values
| Cups (US) | Fluid Ounces (US) |
|---|---|
| 0.25 | 2 |
| 0.5 | 4 |
| 1 | 8 |
| 2 | 16 |
| 4 | 32 |
Common questions
How many fluid ounces are in a cup?
Eight fluid ounces in a US customary cup. Other standards differ slightly, which is why the converter lets you switch.
Why are there five cup standards?
US customary, US legal, metric, UK imperial, and the Japanese 200 mL go all define a cup differently, so recipes from different regions vary.