Fluid Ounces To Cups Conversion (fl Oz To C) - Inch Calculator

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

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Sexton, J. (n.d.). Fluid Ounces to Cups Converter. Inch Calculator. Retrieved January 1, 2026, from https://www.inchcalculator.com/convert/fluid-ounce-to-cup/

How to Convert Fluid Ounces to Cups

To convert a measurement in fluid ounces to a measurement in cups, divide 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:

cups = fluid ounces ÷ 8

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

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

cups = (5 fl oz ÷ 8) = 0.625 c

How Many Cups Are in a Fluid Ounce?

There is 1/8 cup in a fluid ounce, or 0.125 cups if you prefer decimal. This is why you divide by 8 in the conversion formula above.

1 fl oz = 1/8 c = 0.125 c

Measuring Cup IconCommon Ounce to Cup Conversions

• 8 oz to cupsChevron Right Icon
• 12 oz to cupsChevron Right Icon
• 16 oz to cupsChevron Right Icon
• 24 oz to cupsChevron Right Icon
• 32 oz to cupsChevron Right Icon

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

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.

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.

Fluid Ounce to Cup Conversion Table

The chart below shows various volumes in fluid ounces and the equivalent measurement in cups in fraction and decimal form.

Table showing various measurements in fluid ounces converted to cups in fraction and decimal form.

Fluid Ounces	Cups (Fraction)	Cups (Decimal)
0 fl oz	0 c	0 c
1 fl oz	1/8 c	0.125 c
2 fl oz	1/4 c	0.25 c
3 fl oz	3/8 c	0.375 c
4 fl oz	1/2 c	0.5 c
5 fl oz	5/8 c	0.625 c
6 fl oz	3/4 c	0.75 c
7 fl oz	7/8 c	0.875 c
8 fl oz	1 c	1 c
9 fl oz	1 1/8 c	1.125 c
10 fl oz	1 1/4 c	1.25 c
11 fl oz	1 3/8 c	1.375 c
12 fl oz	1 1/2 c	1.5 c
13 fl oz	1 5/8 c	1.625 c
14 fl oz	1 3/4 c	1.75 c
15 fl oz	1 7/8 c	1.875 c
16 fl oz	2 c	2 c
17 fl oz	2 1/8 c	2.125 c
18 fl oz	2 1/4 c	2.25 c
19 fl oz	2 3/8 c	2.375 c
20 fl oz	2 1/2 c	2.5 c
21 fl oz	2 5/8 c	2.625 c
22 fl oz	2 3/4 c	2.75 c
23 fl oz	2 7/8 c	2.875 c
24 fl oz	3 c	3 c
25 fl oz	3 1/8 c	3.125 c
26 fl oz	3 1/4 c	3.25 c
27 fl oz	3 3/8 c	3.375 c
28 fl oz	3 1/2 c	3.5 c
29 fl oz	3 5/8 c	3.625 c
30 fl oz	3 3/4 c	3.75 c
31 fl oz	3 7/8 c	3.875 c
32 fl oz	4 c	4 c

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

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