Fluid Ounces to Cups Converter
Convert US fluid ounces to cups instantly. One US fluid ounce equals exactly 0.125 cups. Type in either box to convert both ways, then use the chart, worked examples and everyday sizes below.
How to convert US fluid ounces to cups
Worked example: convert 15 US fluid ounces to cups. Using cups ← US fluid ounces ÷ 8, we get 15 × 0.125 = 1.875 cup. To check the result, convert back: 1.875 cup ÷ 0.125 = 15 fl oz.
Us fluid ounces to cups chart
| Us fluid ounces (fl oz) | 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 |
| 8 fl oz | 1 cup |
| 10 fl oz | 1.25 cup |
| 12 fl oz | 1.5 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 |
| 75 fl oz | 9.375 cup |
| 100 fl oz | 12.5 cup |
| 150 fl oz | 18.75 cup |
| 200 fl oz | 25 cup |
| 250 fl oz | 31.25 cup |
| 500 fl oz | 62.5 cup |
| 1,000 fl oz | 125 cup |
Cups to US fluid ounces (reverse)
| Cups (cup) | Us fluid ounces (fl oz) |
|---|---|
| 1 cup | 8 fl oz |
| 2 cup | 16 fl oz |
| 5 cup | 40 fl oz |
| 10 cup | 80 fl oz |
| 20 cup | 160 fl oz |
| 50 cup | 400 fl oz |
| 100 cup | 800 fl oz |
| 250 cup | 2,000 fl oz |
| 500 cup | 4,000 fl oz |
| 1,000 cup | 8,000 fl oz |
About the US fluid ounce and the cup
The US fluid ounce is 29.574 milliliters and one eighth of a cup. The UK imperial fluid ounce is slightly smaller at 28.413 ml, so US and UK drink labels differ by about 4%.
The US customary cup is 236.588 milliliters, or 8 US fluid ounces. The US nutrition-label cup is 240 ml and the metric cup used in Australia and New Zealand is 250 ml. Recipes found online usually mean the US cup.
One cup equals 8 US fluid ounces, which makes the cup the larger unit of the two.
Everyday sizes in US fluid ounces and cups
| Everyday example (approximate) | In US fluid ounces | In cups |
|---|---|---|
| A shot glass | 1.4878 fl oz | 0.18598 cup |
| A can of soda | 12.004 fl oz | 1.5005 cup |
| A bottle of wine | 25.361 fl oz | 3.1701 cup |
| A large water bottle | 33.814 fl oz | 4.2268 cup |
| A 2-liter soft drink bottle | 67.628 fl oz | 8.4535 cup |
| A bucket | 338.14 fl oz | 42.268 cup |
Us fluid ounces to cups FAQ
How many cups are in one US fluid ounce?
One US fluid ounce equals exactly 0.125 cups. In the other direction, one cup equals 8 US fluid ounces.
How do I convert US fluid ounces to cups without a calculator?
convert 15 US fluid ounces to cups. Using cups ← US fluid ounces ÷ 8, we get 15 × 0.125 = 1.875 cup. To check the result, convert back: 1.875 cup ÷ 0.125 = 15 fl oz. For a quick estimate, round the factor to 0.12. Then 15 fl oz is about 1.8 cup, compared with the exact 1.875 cup (an error of 4%). That is close enough for planning, but use the calculator above when the number matters.
What is a large water bottle in cups?
A large water bottle is about 33.814 US fluid ounces, which is 4.2268 cups. Treat that as an approximate everyday figure rather than an official measurement.
Are the US fluid ounces and cups the same in every country?
The US fluid ounce is 29.5735 ml; the UK imperial fluid ounce is 28.4131 ml. The US customary cup is 236.588 ml, but a metric cup is 250 ml and a US legal (nutrition label) cup is 240 ml, so check where a recipe comes from.