Cups To Fluid Ounces Conversion (c To Fl Oz) - Inch Calculator

On this page:

Show/hide table of contents Chevron Down Icon

• Cups to Fluid Ounces Converter
• How to Convert Cups to Fluid Ounces
• How Many Fluid Ounces Are in a Cup?
• What Is a Cup?
• What Is a Fluid Ounce?
• Cup to Fluid Ounce Conversion Table
• References

Person Icon By Joe Sexton

Joe is the creator of Inch Calculator and has over 20 years of experience in engineering and construction. He holds several degrees and certifications.

Full bioChevron Right Icon Link Icon Copy Link Facebook Icon Share on Facebook X Icon Share on X Pinterest Icon Share on Pinterest Cite Icon Cite ×Close dialog

Cite This Page

Sexton, J. (n.d.). Cups to Fluid Ounces Converter. Inch Calculator. Retrieved February 18, 2026, from https://www.inchcalculator.com/convert/cup-to-fluid-ounce/

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

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:

Measuring Cup IconQuick Conversions

• Fluid ounces in 2 cupsChevron Right Icon
• Fluid ounces in 3 cupsChevron Right Icon
• Fluid ounces in 4 cupsChevron Right Icon
• Fluid ounces in 5 cupsChevron Right Icon
• Fluid ounces in 6 cupsChevron Right Icon

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

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

More Cup & Fluid Ounce Conversions

Measuring Cup IconConvert from Cups

• cups to gallonsChevron Right Icon
• cups to quartsChevron Right Icon
• cups to pintsChevron Right Icon
• cups to tablespoonsChevron Right Icon
• cups to teaspoonsChevron Right Icon
• cups to cubic inchesChevron Right Icon
• cups to cubic feetChevron Right Icon
• cups to cubic yardsChevron Right Icon
• cups to litersChevron Right Icon
• cups to millilitersChevron Right Icon
• cups to cubic centimetersChevron Right Icon
• cups to cubic metersChevron Right Icon
• cups to ouncesChevron Right Icon
• cups to poundsChevron Right Icon
• cups to milligramsChevron Right Icon
• cups to gramsChevron Right Icon
• cups to kilogramsChevron Right Icon

Measuring Cup IconConvert to Fluid Ounces

• gallons to fluid ouncesChevron Right Icon
• quarts to fluid ouncesChevron Right Icon
• pints to fluid ouncesChevron Right Icon
• tablespoons to fluid ouncesChevron Right Icon
• teaspoons to fluid ouncesChevron Right Icon
• cubic inches to fluid ouncesChevron Right Icon
• cubic feet to fluid ouncesChevron Right Icon
• cubic yards to fluid ouncesChevron Right Icon
• liters to fluid ouncesChevron Right Icon
• milliliters to fluid ouncesChevron Right Icon
• cubic centimeters to fluid ouncesChevron Right Icon
• cubic meters to fluid ouncesChevron Right Icon
• ounces to fluid ouncesChevron Right Icon
• pounds to fluid ouncesChevron Right Icon
• milligrams to fluid ouncesChevron Right Icon
• grams to fluid ouncesChevron Right Icon
• kilograms to fluid ouncesChevron Right Icon