US cups to US fluid ounces
1 US cup = 8 US fluid ounces
Type a value in US cups (cup) to get US fluid ounces (fl oz) straight away. A US cup is larger than a US fluid ounce, so the number goes up. Both units belong to volume, measured here against the liter.
1 cup = 8 fl oz
Formula
fl oz = cup × 8
One US cup is 8 US fluid ounces, so multiply the US cup value by that factor. Here cup is the value in US cups and fl oz is the result in US fluid ounces.
Worked example: 2 US cups × 8 = 16 US fluid ounces.
US cups to US fluid ounces table
| US cups (cup) | US fluid ounces (fl oz) |
|---|---|
| 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 |
| 15 cup | 120 fl oz |
| 20 cup | 160 fl oz |
| 25 cup | 200 fl oz |
| 30 cup | 240 fl oz |
| 40 cup | 320 fl oz |
| 50 cup | 400 fl oz |
| 60 cup | 480 fl oz |
| 75 cup | 600 fl oz |
| 100 cup | 800 fl oz |
Everyday US cups in US fluid ounces
| What it is | cup | fl oz |
|---|---|---|
| a quarter cup | 0.25 cup | 2 fl oz |
| half a cup | 0.5 cup | 4 fl oz |
| one cup | 1 cup | 8 fl oz |
| one pint | 2 cup | 16 fl oz |
| one quart | 4 cup | 32 fl oz |
Quick estimate in your head
Multiply by about 8. For 2 cup that gives 16 fl oz against an exact 16 fl oz, an error under 0.1%.
Watch out for
- Many recipes outside the US use a 250 mL metric cup, about 6% larger than the US cup used here.
- Fluid ounces measure volume and ounces measure weight. 8 fl oz of water weighs about 8.3 oz, but 8 fl oz of flour does not.
About the units
US cup (cup). The US customary cup, about 236.6 mL. Recipes that use metric cups mean 250 mL.
US fluid ounce (fl oz). 1/128 of a US gallon, about 29.57 mL. Used on drink cans and bottles in the US.
Going the other way, 1 US fluid ounce is 0.125 US cups.
Questions
How many US fluid ounces are in 1 US cup?
1 US cup is 8 US fluid ounces, and 1 US fluid ounce is 0.125 US cups.
How do I convert US cups to US fluid ounces?
Use fl oz = cup × 8. For example, 2 US cups × 8 = 16 US fluid ounces.
Are US and UK measures the same?
No. This page uses US customary units. A UK gallon is 4.546 L against 3.785 L in the US, and a UK pint is 568 mL against 473 mL.
How much is one quart in US fluid ounces?
4 cup is 32 fl oz.
Source for the conversion factor: NIST Handbook 44, Appendix C (units of volume).
Related conversions
- US fluid ounces to US cups
- milliliters to US fluid ounces
- US fluid ounces to milliliters
- US cups to milliliters
- US cups to US tablespoons
- liters to US gallons