Cups (US) to Fluid ounces Converter
Convert cups (US) (cup) to fluid ounces (fl oz) instantly. Type a value above and the result updates while you type. 1 cup (US) equals 8 fluid ounces.
Result updates as you type. Values are calculated locally in your browser — nothing is sent to a server.
The formula
1 cup (US) = 8 fluid ounces
Multiply the cups (US) value by 8 to get fluid ounces. Or divide by 0.125 to go the other way.
Cups (US) to fluid ounces conversion table
| cup | fl oz |
|---|---|
| 1 | 8 |
| 2 | 16 |
| 3 | 24 |
| 4 | 32 |
| 5 | 40 |
| 6 | 48 |
| 7 | 56 |
| 8 | 64 |
| 9 | 72 |
| 10 | 80 |
| 15 | 120 |
| 20 | 160 |
| 25 | 200 |
| 50 | 400 |
| 75 | 600 |
| 100 | 800 |
Worked examples
- 5 cup × 8 = 40 fl oz
- 30 cup × 8 = 240 fl oz
- 165 cup × 8 = 1320 fl oz
Conversion factors follow the exact international definitions (SI/BIPM; imperial units per the 1959 International Yard and Pound Agreement, maintained by NIST). NIST unit conversion reference
Factors last verified August 2026 · Built by Jeffrey Tepper.
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Frequently asked questions
How many fluid ounces are in 1 cup (US)?
1 cup (US) equals 8 fluid ounces (cup → fl oz).
How do you convert cups (US) to fluid ounces?
Multiply the number of cups (US) by 8. For example: 10 cup × 8 = 80 fl oz.
What is 50 cup in fl oz?
50 cup equals 400 fl oz.
Which is bigger: 1 cup (US) or 1 fluid ounce?
1 cup (US) is bigger: it equals 8 fluid ounces.