Cups to Ounces Converter
Convert cups to fluid ounces instantly. Enter US cups to get fluid ounces, with the factor of 8 and the reverse fluid ounces to cups direction shown.
Updated 2026-06-14 · Free · No sign-up · Runs privately in your browser
Show the formula & steps
How the Cups to Ounces Converter Works
This tool converts US cups to US fluid ounces and back. Both are volume units used in cooking and recipes. One cup is defined as 8 fluid ounces, which makes the conversion quick and exact for liquids.
The Formula
Fluid ounces = cups × 8 Cups = fluid ounces ÷ 8
This is volume to volume, so it works directly for any liquid such as water, milk or oil.
Worked Example
Convert 2 cups to fluid ounces:
- Fluid ounces = 2 × 8 = 16 fl oz
A common recipe amount, 3/4 cup:
- 0.75 × 8 = 6 fl oz
Going the other way, 12 fluid ounces in cups:
- Cups = 12 ÷ 8 = 1.5 cups
Cups to Fluid Ounces Quick Reference
| Cups | Fluid ounces |
|---|---|
| 1/4 | 2 |
| 1/2 | 4 |
| 3/4 | 6 |
| 1 | 8 |
| 2 | 16 |
Fluid Ounces vs Dry Ounces
This converter handles fluid ounces, a measure of volume. Recipes that call for an ingredient by weight use dry ounces, which are not the same. A cup of flour weighs about 4.25 dry ounces while a cup of water weighs about 8.3 dry ounces, even though both occupy 8 fluid ounces. For weight-based recipes, use a kitchen scale instead.
Frequently asked questions
How many ounces are in a cup?+
One US cup equals 8 US fluid ounces. So 2 cups is 16 fluid ounces. To convert cups to fluid ounces, multiply by 8.
How do I convert cups to ounces?+
Multiply the number of cups by 8. For example, 2.5 cups × 8 = 20 fluid ounces. To reverse it, divide fluid ounces by 8 to get cups.
Are these fluid ounces or dry ounces?+
This converter uses fluid ounces, which measure volume. Dry ounces measure weight, and the conversion depends on the ingredient, so cups of flour and cups of sugar weigh different amounts even though both equal 8 fluid ounces by volume.
What is 3/4 cup in ounces?+
Three quarters of a cup equals 6 fluid ounces (0.75 × 8). Half a cup is 4 fluid ounces and a quarter cup is 2 fluid ounces.
Is a US cup the same as a UK cup?+
No. A US cup is 8 US fluid ounces (about 237 mL), while a UK or metric cup is 250 mL. This converter uses US customary cups and fluid ounces.