Convert CUPS to OZ, Free
Type any CUPS value and see the OZ result instantly. No button press needed.
How to convert CUPS to OZ
One US cup equals exactly 8 US fluid ounces. This relationship is fixed by definition: the US cup is 236.588 mL and the US fluid ounce is 29.5735 mL, making the ratio exactly 8. So 2.5 cups is 20 fl oz, and 0.75 cups is 6 fl oz.
This converter is designed for cooking and baking, where recipes frequently call for cup measurements but liquid measuring jugs are marked in ounces. It also handles fractional cups, so you can convert values like 1/3 cup (enter 0.333) or 2/3 cup (enter 0.667) to their fluid ounce equivalents without manual calculation.
Enter the number of cups
Type your cup value into the input box. Decimals are supported, so 0.5 or 0.333 are valid inputs.
Read the fluid ounces result
The equivalent in US fluid ounces appears instantly below the input.
Copy the result
Use the copy button to send the value to your clipboard for use in a recipe or document.
Frequently asked questions
How many fluid ounces are in a cup?
One US cup equals exactly 8 US fluid ounces. This is the standard used in American recipes and on US measuring equipment.
Is this for US cups or metric cups?
This converter uses US cups (236.588 mL). A metric cup used in Australia and Canada is 250 mL, which equals approximately 8.45 US fluid ounces. If your recipe is from an Australian cookbook, the values will differ slightly.
Does this convert to weight ounces or fluid ounces?
Fluid ounces (volume), not weight ounces. A fluid ounce measures volume. Weight ounces measure mass, and the two are only equal for water at a specific temperature.
How do I convert cups to milliliters instead?
One US cup is 236.588 mL. Multiply your cup value by 236.588 to get milliliters.
Can I convert fractions of a cup?
Yes. Enter decimal values: 1/4 cup is 0.25, 1/3 cup is approximately 0.333, 1/2 cup is 0.5, and 3/4 cup is 0.75.