Convert US Cup (cup) to Fluid Ounce (fl oz) instantly. Enter any value — result updates live.
Converting US Cup to Fluid Ounce is a common volume conversion. One us cup (cup) equals 8 fluid ounce (fl oz). Cups are the most common volume measurement in American home cooking and baking.
This conversion is commonly needed for fuel and vehicle maintenance, aquarium and pool sizing, shipping liquid products. Fluid ounces measure liquid volumes for beverages, cosmetics, and medicine in the US.
To put us cup in perspective: 2 cups of flour for a basic cake recipe. In fluid ounce, common references include a shot of espresso (about 1 fl oz).
The US cup (240 mL) isn't a formally defined SI or imperial unit — it varies slightly from Commonwealth and Japanese 'cup' measurements, a common source of recipe conversion errors.
Despite sharing a name, the US fluid ounce (29.57 mL) and UK fluid ounce (28.41 mL) differ by about 4%, a quirk of divergent imperial standards after the US and UK measurement systems split in the 19th century.
People frequently convert between us cup and fluid ounce for:
| US Cup (cup) | Fluid Ounce (fl oz) |
|---|---|
| 1 cup | 8 fl oz |
| 2 cup | 16 fl oz |
| 5 cup | 40 fl oz |
| 10 cup | 80 fl oz |
| 15 cup | 120 fl oz |
| 20 cup | 160 fl oz |
| 25 cup | 200 fl oz |
| 30 cup | 240 fl oz |
| 50 cup | 400 fl oz |
| 100 cup | 800 fl oz |
| 200 cup | 1,600 fl oz |
| 500 cup | 4,000 fl oz |
| 1000 cup | 8,000 fl oz |