Cups to Fluid Ounces Converter

How to convert cups to fluid ounces

fluid ounces = cups × 8

1 US cup is exactly 8 US fluid ounces (half a US liquid pint). 1 US fluid ounce is 1/128 US gallon.

The factor is exact in both directions: 1 cup = 8 fl oz and 1 fl oz = 0.125 cup. Nothing is rounded until you choose how many decimals to show.

Worked example: 2.5 cups

1. Start with the value in cups: 2.5 cups.
2. Multiply by 8, because 1 cup = 8 fluid ounces: 2.5 × 8 = 20 fl oz.

Cups and fluid ounces side by side

Cups to fluid ounces chart

Print chart

Cups from 0.25 to 8 converted to fluid ounces with the exact factor, shown to five significant digits.

Cups to fluid ounces, part 1 of 1

cup	fl oz
0.25	2
0.333333333333	2.6667
0.5	4
0.666666666667	5.3333
0.75	6
1	8
1.5	12
2	16
3	24
4	32
5	40
6	48
8	64

fluid ounces = cups × 8. Factors: NIST SP 811, NIST Handbook 44. unitcheck.net/cooking/cups-to-fluid-ounces/

Which cup, tablespoon and teaspoon?

All kitchen measures on this page are US customary: 1 cup is 8 US fluid ounces (236.5882365 mL), 1 tablespoon is half a fluid ounce (14.78676 mL) and 1 teaspoon is a third of a tablespoon (4.928922 mL). Cups and spoons sold in other countries can hold a different amount, so for a recipe written outside the United States check which measure the author means.

Going the other way? Use the Fluid Ounces to Cups converter.