Convert between length, weight, temperature, volume, speed, area, and digital units.
How to Convert Cups to Fluid Ounces
Multiply the number of US cups by 8. One US customary cup is defined as exactly 8 US fluid ounces, so the answer is always a whole-number multiple: 1/2 cup is 4 fl oz, 2 cups is 16 fl oz, a quart (4 cups) is 32 fl oz.
Cups to Fluid Ounces Conversion Table
| Cups | Fluid Ounces |
|---|---|
| 0.5 | 4 |
| 1 | 8 |
| 2 | 16 |
| 5 | 40 |
| 10 | 80 |
| 15 | 120 |
| 20 | 160 |
| 25 | 200 |
| 50 | 400 |
| 100 | 800 |
| 250 | 2000 |
| 500 | 4000 |
| 1000 | 8000 |
How Many Fluid Ounces in a Cup?
1 cup equals 8 fluid ounces. To convert any value, multiply the number of cups by 8.
Common Use Cases
Home cooks converting a recipe to what is on the measuring jug use this constantly. Most liquid measuring cups in the US are marked in both cups and fluid ounces, and a recipe that asks for 1.5 cups of stock is simply 12 fl oz on the same jug. The conversion only applies to volume: a cup of flour does not weigh 8 ounces, so dry ingredients measured by weight need a kitchen scale instead.
People tracking how much they drink count in both units. Water bottles and coffee cups are labelled in fluid ounces while hydration advice is often given in cups, so 8 cups a day is 64 fl oz, which is four 16 oz bottles or a little under two 33.8 oz (1 liter) bottles.
Parents and caregivers measuring milk or formula switch between cups and ounces on bottles and pitchers. A 4 oz bottle is half a cup, an 8 oz bottle is one cup, and a 32 oz pitcher holds four cups, which makes it easy to check how much is left without a separate measuring tool.