US fluid ounces to US cups
1 US fluid ounce = 0.125 US cups
Type a value in US fluid ounces (fl oz) to get US cups (cup) straight away. A US fluid ounce is smaller than a US cup, so the number goes down. Both units belong to volume, measured here against the liter.
1 fl oz = 0.125 cup
Formula
cup = fl oz × 0.125
One US fluid ounce is 0.125 US cups, so multiply by that factor. You can also divide by 8, the number of US fluid ounces in one US cup. Here fl oz is the value in US fluid ounces and cup is the result in US cups.
Worked example: 8 US fluid ounces × 0.125 = 1 US cup.
US fluid ounces to US cups table
| US fluid ounces (fl oz) | US cups (cup) |
|---|---|
| 1 fl oz | 0.125 cup |
| 2 fl oz | 0.25 cup |
| 3 fl oz | 0.375 cup |
| 4 fl oz | 0.5 cup |
| 5 fl oz | 0.625 cup |
| 6 fl oz | 0.75 cup |
| 7 fl oz | 0.875 cup |
| 8 fl oz | 1 cup |
| 9 fl oz | 1.125 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 |
| 40 fl oz | 5 cup |
| 50 fl oz | 6.25 cup |
| 60 fl oz | 7.5 cup |
| 75 fl oz | 9.375 cup |
| 100 fl oz | 12.5 cup |
Everyday US fluid ounces in US cups
| What it is | fl oz | cup |
|---|---|---|
| a shot glass (about) | 1 fl oz | 0.125 cup |
| one cup | 8 fl oz | 1 cup |
| a soda can | 12 fl oz | 1.5 cup |
| a pint bottle | 16 fl oz | 2 cup |
| the carry-on liquids limit (100 mL) | 3.4 fl oz | 0.425 cup |
Quick estimate in your head
Multiply by about 5/4 × 0.1. For 8 fl oz that gives 1 cup against an exact 1 cup, an error under 0.1%.
Watch out for
- 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.
- Many recipes outside the US use a 250 mL metric cup, about 6% larger than the US cup used here.
About the units
US fluid ounce (fl oz). 1/128 of a US gallon, about 29.57 mL. Used on drink cans and bottles in the US.
US cup (cup). The US customary cup, about 236.6 mL. Recipes that use metric cups mean 250 mL.
Going the other way, 1 US cup is 8 US fluid ounces.
Questions
How many US cups are in 1 US fluid ounce?
1 US fluid ounce is 0.125 US cups, and 1 US cup is 8 US fluid ounces.
How do I convert US fluid ounces to US cups?
Use cup = fl oz × 0.125. For example, 8 US fluid ounces × 0.125 = 1 US cup.
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 the carry-on liquids limit (100 mL) in US cups?
3.4 fl oz is 0.425 cup.
Source for the conversion factor: NIST Handbook 44, Appendix C (units of volume).
Related conversions
- US cups to US fluid ounces
- US fluid ounces to milliliters
- milliliters to US cups
- US cups to milliliters
- US cups to US tablespoons
- US tablespoons to US cups