How ounces to cups are calculated
A US cup is exactly eight US fluid ounces, so the conversion is a division by eight.
1 US cup = 8 US fluid ounces = 236.588 ml
- One US fluid ounce is 29.57353 ml and one US cup is 236.588 ml, so 8 fl oz fills one cup.
- Divide your ounces by 8 for US cups, or multiply your cups by 8 to go back.
- An Imperial fluid ounce is 28.41306 ml and an Imperial cup is 284.131 ml, so 10 Imperial fl oz fills one cup.
- A metric cup is 250 ml, between the two, and the result shows your amount in metric cups too.
Worked example — 12 US fluid ounces ÷ 8 = 1.5 US cups, which is 354.9 ml, or 1.42 metric cups.
Common amounts converted
| Fluid ounces (US) | US cups | Metric cups (250 ml) | Millilitres |
|---|---|---|---|
| 1 fl oz | 0.13 cups | 0.12 cups | 29.6 ml |
| 2 fl oz | 0.25 cups | 0.24 cups | 59.1 ml |
| 4 fl oz | 0.5 cups | 0.47 cups | 118.3 ml |
| 8 fl oz | 1 cups | 0.95 cups | 236.6 ml |
| 12 fl oz | 1.5 cups | 1.42 cups | 354.9 ml |
| 16 fl oz | 2 cups | 1.89 cups | 473.2 ml |
| 24 fl oz | 3 cups | 2.84 cups | 709.8 ml |
| 32 fl oz | 4 cups | 3.79 cups | 946.4 ml |
Swipe the table sideways to see the rest.
To go the other way, switch the converter above to Cups → ounces.
Things to consider
- Ounces of flour or sugar are weight, not volume — a cup of flour is not 8 oz.
- Check the cup you own: baking cups are often 250 ml, US liquid cups 236.6 ml.
- For small amounts use the tablespoon line — one US cup is 16 tablespoons.
- The US and metric cups differ by about 6%, which shows up in baking.
Frequently asked questions
How many ounces in a cup?
8 US fluid ounces in a US cup, 10 Imperial fluid ounces in an Imperial cup, and about 8.45 US fluid ounces in a 250 ml metric cup.
Is 8 ounces the same as 1 cup?
Yes for US fluid ounces and US cups. For dry ingredients, 8 oz by weight is not the same as a cup.
What is 4 ounces in cups?
4 US fluid ounces is 0.5 US cup, or 118.3 ml — just under half a 250 ml metric cup.
Is a cup 250 ml or 236 ml?
A US cup is 236.588 ml; a metric cup is 250 ml. The difference is about 6%, which matters in baking.
How do I turn cups back into ounces?
Multiply cups by 8 for US fluid ounces, or switch this converter to Cups → ounces.
Results are estimates for general information only, not financial, medical or professional advice.