Cups to Fluid Ounces Conversion (c to fl oz)

Cups to Fluid Ounces Converter

Enter the volume in cups below to convert it to fluid ounces.

Result in Fluid Ounces:

1 c = 8 fl oz

How to Convert Cups to Fluid Ounces

To convert a measurement in cups to a measurement in fluid ounces, multiply the volume by the following conversion ratio: 8 fluid ounces/cup.

Since one cup is equal to 8 fluid ounces, you can use this simple formula to convert:

fluid ounces = cups × 8

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

For example, here's how to convert 5 cups to fluid ounces using the formula above.

fluid ounces = (5 c × 8) = 40 fl oz

conversion scale showing cups and equivalent fluid ounces volume values

How Many Fluid Ounces Are in a Cup?

There are 8 fluid ounces in a cup, which is why we use this value in the formula above.

1 c = 8 fl oz

For fractional cups, such as those used in cooking and baking, multiply the fraction by 8 to convert the measurement to ounces. If you have a fraction of a cup, multiplying it by 8 gives you the equivalent volume in ounces.

You can also use the following for more than one cup:

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

What Is a Cup?

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 standard cup is equal to 236.588 milliliters, but for nutrition labeling, one cup is defined as 240 milliliters.^[1] To further confuse things, a metric cup is equal to 250 mL, while in Japan, a cup is equivalent to only 200 mL.

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.

Learn more about cups.

What Is a Fluid Ounce?

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 just an "ounce" but should not be confused with the unit of weight. One fluid ounce is equal to approximately 29.5735 milliliters, but in nutrition labeling, one fluid ounce is rounded to exactly 30 milliliters.^[1]

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

Learn more about fluid ounces.

Cup to Fluid Ounce Conversion Table

Table showing various 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

Table showing various 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

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