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US Cups to US Fluid Ounces (cup to fl oz) Converter

1 US cup (cup) = 8 US fluid ounces (fl oz). To convert US cups to US fluid ounces, multiply by 8: 2 cup × 8 = 16 fl oz.

1 cup = 7.9999999899 fl oz
Convert the other way: US Fluid Ounces to US Cups

Quick facts

How to convert US cups to US fluid ounces

  1. Take the value in US cups.
  2. Multiply it by 8 (the number of US fluid ounces in one US cup).
  3. Round the result to the precision you need.
fl oz = cup × 8

Worked example (a recipe): 2 cup × 8 = 16 fl oz.

To convert US fluid ounces back to US cups, multiply by 0.125, or divide by 8.

Source: NIST Handbook 44, Appendix C, and NIST SP 811 (US customary volume units).

US Cups to US Fluid Ounces conversion table

US Cups to US Fluid Ounces conversion table
US Cups [cup]US Fluid Ounces [fl oz]
0.01 cup0.0799999999 fl oz
0.1 cup0.799999999 fl oz
1 cup7.9999999899 fl oz
2 cup15.9999999797 fl oz
3 cup23.9999999696 fl oz
5 cup39.9999999493 fl oz
10 cup79.9999998986 fl oz
20 cup159.9999997971 fl oz
50 cup399.9999994928 fl oz
100 cup799.9999989856 fl oz
1000 cup7999.9999898558 fl oz

cup to fl oz chart from 1 to 100

US Fluid Ounces to US Cups conversion table

US Fluid Ounces to US Cups conversion table
US Fluid Ounces [fl oz]US Cups [cup]
0.01 fl oz0.00125 cup
0.1 fl oz0.0125 cup
1 fl oz0.1250000002 cup
2 fl oz0.2500000003 cup
3 fl oz0.3750000005 cup
5 fl oz0.6250000008 cup
10 fl oz1.2500000016 cup
20 fl oz2.5000000032 cup
50 fl oz6.2500000079 cup
100 fl oz12.5000000159 cup
1000 fl oz125.0000001585 cup

US Cups vs US Fluid Ounces

US CupUS Fluid Ounce
Symbolcupfl oz
Equals1 cup = 8 fl oz1 fl oz = 0.125 cup

What is a US cup?

A US customary cooking measure equal to 8 fluid ounces. The standard recipe measure for liquids and dry ingredients in the US.

What is a US fluid ounce?

A US customary unit equal to 1/16 of a US pint. Used in the US for beverage and bottle sizes.

Frequently asked questions

How many US fluid ounces are in a US cup?

There are 8 US fluid ounces in 1 US cup (1 cup = 7.9999999899 fl oz).

How many US cups are in a US fluid ounce?

There are 0.125 US cups in 1 US fluid ounce (1 fl oz = 0.1250000002 cup).

How do I convert US cups to US fluid ounces?

Multiply the number of US cups by 8. For example, 10 cup × 8 = 80 fl oz. To convert back, multiply by 0.125.

What is 10 cup in US fluid ounces?

10 cup = 80 fl oz.

What is 100 cup in US fluid ounces?

100 cup = 800 fl oz.

Is the conversion exact?

Yes. The factor comes from the official definitions of both units (NIST Handbook 44, Appendix C, and NIST SP 811 (US customary volume units)). Results are shown to up to 10 decimal places; round them to suit your purpose.

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Reviewed by

Dr. Muhammad Amjad Khadim PhD Mathematics

Dr. Muhammad Amjad Khadim holds a PhD in Mathematics. He writes and reviews the guides on pakmath.com and checks every formula, conversion factor and worked example against published standards and official guidance before it goes live. Spotted an error? Tell us and it will be corrected.

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First published 28 October 2026 · Last reviewed 5 November 2026