Convert Fluid Ounce (fl oz) to US Cup (cup) instantly. Enter any value — result updates live.
Converting Fluid Ounce to US Cup is a common volume conversion. One fluid ounce (fl oz) equals 0.125 us cup (cup). Fluid ounces measure liquid volumes for beverages, cosmetics, and medicine in the US.
This conversion is commonly needed for home brewing and winemaking, cooking and baking recipes, fuel and vehicle maintenance. Cups are the most common volume measurement in American home cooking and baking.
To put fluid ounce in perspective: a shot of espresso (about 1 fl oz). In us cup, common references include a cup of rice (uncooked, about 185 g).
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.
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.
People frequently convert between fluid ounce and us cup for:
| Fluid Ounce (fl oz) | US Cup (cup) |
|---|---|
| 1 fl oz | 0.125 cup |
| 2 fl oz | 0.25 cup |
| 5 fl oz | 0.625 cup |
| 10 fl oz | 1.25 cup |
| 15 fl oz | 1.875 cup |
| 20 fl oz | 2.5 cup |
| 25 fl oz | 3.125 cup |
| 30 fl oz | 3.75 cup |
| 50 fl oz | 6.25 cup |
| 100 fl oz | 12.5 cup |
| 200 fl oz | 25 cup |
| 500 fl oz | 62.5 cup |
| 1000 fl oz | 125 cup |