Convert US cups to Imperial fluid ounces
1 US cup is 8.33 fl oz (UK). One US cup is exactly 8.32674184629 imperial fluid ounces.
One US cup is 8.3267418 imperial fluid ounces. To convert US cups to imperial fluid ounces, multiply by 8.3267418; to go the other way, divide by 8.3267418 or multiply by 0.12009499. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and 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 × 8.3267418
1 * 8.32674188.327 fl oz (UK)
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 imperial fluid ounces? The converter and the working
- 1.Take the measurement in US cups.
- 2.Multiply by 8.3267418 — that is how many imperial fluid ounces fit in one US cup.
- 3.To go back the other way, divide by 8.3267418, or multiply by 0.12009499.
Worked example: 25 US cups to imperial fluid ounces
- Formula
- cup × 8.3267418 = fl oz (UK)
- Arithmetic
- 25 × 8.3267418 = 208.17 fl oz (UK)
- Answer
- 25 cup = 208.17 fl oz (UK)
The factor is rounded for display; the figure above is computed from the full value.
US cups to imperial fluid ounces conversion table
| US cups | Imperial fluid ounces |
|---|---|
| 1 cup | 8.33 fl oz (UK) |
| 2 cup | 16.65 fl oz (UK) |
| 3 cup | 24.98 fl oz (UK) |
| 4 cup | 33.31 fl oz (UK) |
| 5 cup | 41.63 fl oz (UK) |
| 6 cup | 49.96 fl oz (UK) |
| 7 cup | 58.29 fl oz (UK) |
| 8 cup | 66.61 fl oz (UK) |
| 9 cup | 74.94 fl oz (UK) |
| 10 cup | 83.27 fl oz (UK) |
| 12 cup | 99.92 fl oz (UK) |
| 15 cup | 124.9 fl oz (UK) |
| 20 cup | 166.53 fl oz (UK) |
| 25 cup | 208.17 fl oz (UK) |
| 50 cup | 416.34 fl oz (UK) |
| 100 cup | 832.67 fl oz (UK) |
| 200 cup | 1,665.35 fl oz (UK) |
| 300 cup | 2,498.02 fl oz (UK) |
| 500 cup | 4,163.37 fl oz (UK) |
| 1000 cup | 8,326.74 fl oz (UK) |
| 2000 cup | 16,653.48 fl oz (UK) |
| 5000 cup | 41,633.71 fl oz (UK) |
| 10000 cup | 83,267.42 fl oz (UK) |
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 an imperial fluid ounce?
One 160th of an imperial gallon, 28.4130625 ml exactly. The US fluid ounce is one 128th of a smaller gallon at 29.57 ml, so the two ounces differ by about 4% in the opposite direction to the gallons.
How many imperial fluid ounces are in a US cup?
One US cup is 8.3267418 imperial fluid ounces. Going the other way, one imperial fluid ounce is 0.12009499 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 imperial fluid ounces. Rule Calculator. https://rulecalculators.com/convert/cup-to-imperial-fluid-ounce
- MLA
- "Convert US cups to imperial fluid ounces." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/cup-to-imperial-fluid-ounce.
- Chicago
- Rule Calculator. "Convert US cups to imperial fluid ounces." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/cup-to-imperial-fluid-ounce.
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Questions people actually ask
- How many imperial fluid ounces are in a US cup?
- 8.3267418. One 160th of an imperial gallon, 28.4130625 ml exactly. The US fluid ounce is one 128th of a smaller gallon at 29.57 ml, so the two ounces differ by about 4% in the opposite direction to the gallons.
- How do I convert imperial fluid ounces back to US cups?
- Divide by 8.3267418, or multiply by 0.12009499 — they are the same operation.
Other volume conversions
Imperial fluid ounces to US cups — the same conversion the other way.