Cups to Fluid Ounces Conversion

Enter the volume in cups below to get the value converted to fluid ounces.

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1 c = 8 fl oz

How to Convert Cups to Fluid Ounces

conversion scale showing cups and equivalent fluid ounces volume values

To convert a cup measurement to a fluid ounce measurement, multiply the volume by the conversion ratio. One cup is equal to 8 fluid ounces, so use this simple formula to convert:

fluid ounces = cups × 8

The volume in fluid ounces is equal to the cups multiplied by 8.

For example, here's how to convert 5 cups to fluid ounces using the formula above.
5 c = (5 × 8) = 40 fl oz

Cups and fluid ounces are both units used to measure volume. Keep reading to learn more about each unit of measure.

Cups

The cup is a unit of volume equal to 16 tablespoons or 8 fluid ounces. The cup should not be confused with the metric cup or the teacup, which are different units of volume. One cup is equal to just under 236.6 milliliters, but in nutrition labelling, one cup is equal to 240 milliliters.[1]

The cup is a US customary unit of volume. Cups can be abbreviated as c, and are also sometimes abbreviated as C. For example, 1 cup can be written as 1 c or 1 C.

Fluid Ounces

The US fluid ounce is a unit of volume equal to 1/16 of a pint or 1/8 of a cup. The fluid ounce is sometimes referred to as an "ounce" but should not be confused with the unit of mass. One fluid ounce is equal to just under 29.6 milliliters, but in nutrition labelling, one fluid ounce is rounded to exactly 30 milliliters.[2]

The fluid ounce is a US customary unit of volume. Fluid ounces can be abbreviated as fl oz, and are also sometimes abbreviated as fl. oz. or oz. fl.. For example, 1 fluid ounce can be written as 1 fl oz, 1 fl. oz., or 1 oz. fl..

Cup to Fluid Ounce Conversion Table

Cup measurements converted to fluid ounces
Cups Fluid Ounces
1 c 8 fl oz
2 c 16 fl oz
3 c 24 fl oz
4 c 32 fl oz
5 c 40 fl oz
6 c 48 fl oz
7 c 56 fl oz
8 c 64 fl oz
9 c 72 fl oz
10 c 80 fl oz
11 c 88 fl oz
12 c 96 fl oz
13 c 104 fl oz
14 c 112 fl oz
15 c 120 fl oz
16 c 128 fl oz
17 c 136 fl oz
18 c 144 fl oz
19 c 152 fl oz
20 c 160 fl oz
21 c 168 fl oz
22 c 176 fl oz
23 c 184 fl oz
24 c 192 fl oz
25 c 200 fl oz
26 c 208 fl oz
27 c 216 fl oz
28 c 224 fl oz
29 c 232 fl oz
30 c 240 fl oz
31 c 248 fl oz
32 c 256 fl oz
33 c 264 fl oz
34 c 272 fl oz
35 c 280 fl oz
36 c 288 fl oz
37 c 296 fl oz
38 c 304 fl oz
39 c 312 fl oz
40 c 320 fl oz

References

  1. U.S. Food & Drug Administration, Guidance for Industry: Guidelines for Determining Metric Equivalents of Household Measures, https://www.fda.gov/regulatory-information/search-fda-guidance-documents/guidance-industry-guidelines-determining-metric-equivalents-household-measures
  2. U.S. Food & Drug Administration, Guidance for Industry: Guidelines for Determining Metric Equivalents of Household Measures, https://www.fda.gov/regulatory-information/search-fda-guidance-documents/guidance-industry-guidelines-determining-metric-equivalents-household-measures