Convert US cups to US fluid ounces
1 US cup is 8 fl oz. One US cup is exactly 8 US fluid ounces.
One US cup is 8 US fluid ounces. To convert US cups to US fluid ounces, multiply by 8; to go the other way, divide by 8 or multiply by 0.125. The factor is exact rather than rounded: it follows from NIST Handbook 130. Eight US fluid ounces, about 236.6 ml.
Factor checked against the defining standard · How we check
- US cups × 8
1 * 88 fl oz
1 US cup in every volume unit
| Unit | Value | Exact factor |
|---|---|---|
| US teaspoons | 48 tsp | × 48 |
| US tablespoons | 16 tbsp | × 16 |
| US fluid ounces | 8 fl oz | × 8 |
| US cups (as entered) | 1 cup | — |
| US pints | 0.5 pt | × 0.5 |
| US quarts | 0.25 qt | × 0.25 |
| US gallons | 0.0625 gal | × 0.0625 |
| milliliters | 236.5882365 ml | × 236.5882365 |
| liters | 0.2365882365 L | × 0.2365882365 |
| imperial gallons | 0.05204213654 gal (UK) | × 0.0520421365393 |
| imperial quarts | 0.2081685462 qt (UK) | × 0.208168546157 |
| imperial pints | 0.4163370923 pt (UK) | × 0.416337092314 |
| imperial fluid ounces | 8.326741846 fl oz (UK) | × 8.32674184629 |
| imperial gills | 1.665348369 gi (UK) | × 1.66534836926 |
| cubic millimetres | 236,588.2365 mm³ | × 236,588.2365 |
| cubic centimetres | 236.5882365 cm³ | × 236.5882365 |
| cubic inches | 14.4375 in³ | × 14.4375 |
| cubic feet | 0.008355034722 ft³ | × 0.00835503472222 |
| cubic yards | 0.0003094457305 yd³ | × 0.000309445730453 |
| cubic metres | 0.0002365882365 m³ | × 0.0002365882365 |
Factors are entered by hand from NIST Handbook 130 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert US cups to US fluid ounces? The converter and the working
- 1.Take the measurement in US cups.
- 2.Multiply by 8 — that is how many US fluid ounces fit in one US cup.
- 3.To go back the other way, divide by 8, or multiply by 0.125.
Worked example: 25 US cups to US fluid ounces
- Formula
- cup × 8 = fl oz
- Arithmetic
- 25 × 8 = 200 fl oz
- Answer
- 25 cup = 200 fl oz
The factor is exact, so this figure is exact too — only the display is rounded.
US cups to US fluid ounces conversion table
| US cups | US fluid ounces |
|---|---|
| 1 cup | 8 fl oz |
| 2 cup | 16 fl oz |
| 3 cup | 24 fl oz |
| 4 cup | 32 fl oz |
| 5 cup | 40 fl oz |
| 6 cup | 48 fl oz |
| 7 cup | 56 fl oz |
| 8 cup | 64 fl oz |
| 9 cup | 72 fl oz |
| 10 cup | 80 fl oz |
| 12 cup | 96 fl oz |
| 15 cup | 120 fl oz |
| 20 cup | 160 fl oz |
| 25 cup | 200 fl oz |
| 50 cup | 400 fl oz |
| 100 cup | 800 fl oz |
| 200 cup | 1,600 fl oz |
| 300 cup | 2,400 fl oz |
| 500 cup | 4,000 fl oz |
| 1000 cup | 8,000 fl oz |
| 2000 cup | 16,000 fl oz |
| 5000 cup | 40,000 fl oz |
| 10000 cup | 80,000 fl oz |
What is a US cup?
Eight US fluid ounces, about 236.6 ml. The "legal" cup on nutrition labels is a rounded 240 ml.
What is a US fluid ounce?
Exactly one 128th of a US gallon, which makes it 29.5735295625 ml exactly. The imperial fluid ounce is a different unit at exactly 28.4130625 ml, so a UK recipe calling for 10 fl oz means 284 ml and a US one means 296 ml. It is also a volume, not a weight: an ounce of flour is not a fluid ounce of flour.
How many US fluid ounces are in a US cup?
One US cup is 8 US fluid ounces, exactly. Going the other way, one US fluid ounce is 0.125 US cups. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every volume unit here
The whole group — 20 units with their symbols and the size of each one in liters — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a US cup.
Cite this page
- APA
- Rule Calculator. (2026). Convert US cups to US fluid ounces. Rule Calculator. https://rulecalculators.com/convert/cup-to-fluid-ounce
- MLA
- "Convert US cups to US fluid ounces." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/cup-to-fluid-ounce.
- Chicago
- Rule Calculator. "Convert US cups to US fluid ounces." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/cup-to-fluid-ounce.
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Questions people actually ask
- How many US fluid ounces are in a US cup?
- 8. Exactly one 128th of a US gallon, which makes it 29.5735295625 ml exactly. The imperial fluid ounce is a different unit at exactly 28.4130625 ml, so a UK recipe calling for 10 fl oz means 284 ml and a US one means 296 ml. It is also a volume, not a weight: an ounce of flour is not a fluid ounce of flour.
- How do I convert US fluid ounces back to US cups?
- Divide by 8, or multiply by 0.125 — they are the same operation.
Other volume conversions
US fluid ounces to US cups — the same conversion the other way.