How many cups is equal to 8 oz?

If oz means U.S. fluid ounces, 8 oz equals 1 U.S. cup.

How many oz to a cup?

In this page's U.S. volume system, 1 U.S. cup equals 8 U.S. fluid ounces.

How much is 3 oz to a cup?

3 U.S. fluid ounces equals 0.375 U.S. cup, or three-eighths of a cup.

Yes. If oz means U.S. fluid ounces, 16 oz equals 2 U.S. cups.

How much is 4 oz to a cup?

4 U.S. fluid ounces equals 0.5 U.S. cup, or one-half cup.

Does oz here mean fluid ounces or weight ounces?

This page treats oz as fluid ounces because the page is about volume conversion, not weight conversion.

Are these U.S. cups or metric / imperial cups?

This first version uses U.S. cups and U.S. fluid ounces so the rule stays fixed and unambiguous.

Volume conversion tool

Oz to Cups Converter

Convert oz to cups or switch the direction to cups to oz. This page uses U.S. fluid ounces and U.S. cups and is designed to answer common searches such as 8 oz to cups, 32 oz to cups, and 1 cup to oz.

Convert fluid ounces and cups

Enter a value, switch the direction if needed, and get the answer immediately without scanning a general-purpose converter.

Value to convert

Enter any numeric value. The default example starts with 8 fluid ounces.

From unit

To unit

U.S. volume standard

Conversion result

See the converted value, a plain-language summary, and the fixed U.S. cup-to-fluid-ounce relationship in one place.

Converted value

Summary

8 fl oz = 1 cup.

Conversion rule

1 U.S. fluid ounce = 0.125 U.S. cup.

Quick examples

Start with the ounce-to-cup conversions people use most often. Tap any example to load it into the converter instantly.

Focused pair workflow

How this page works

This page is narrower than the general unit converter. It keeps the task focused on one volume pair so you can get the answer faster without scanning a broader workspace.

1. Enter a value

Start with the number of fluid ounces or cups that you want to convert.

2. Choose the direction

Switch between fluid ounces to cups and cups to fluid ounces with the unit selectors or the swap button.

3. Read the answer and examples

The result updates immediately and stays aligned with common presets such as 8 oz, 16 oz, 32 oz, and 1 cup to oz.

Important notes

This page treats oz as U.S. fluid ounces, not weight ounces.

The page uses the U.S. volume relationship 1 cup = 8 fluid ounces.

If your task is really about weight, use a weight-based conversion such as ounces to pounds instead of this page.

If your task is cups to grams, you need ingredient density. That is a different problem from a direct volume conversion.

Sources and references

These public references support the U.S. cup and U.S. fluid ounce relationship used on this page and explain the broader unit-conversion standards behind it.

NIST: Approximate Conversions from Metric to U.S. Customary Measures

Public conversion reference covering common U.S. customary volume relationships, including practical everyday measurement conversions.

NIST: SI Units

Public reference for SI unit definitions and measurement-system context used when relating everyday volume units to standard unit systems.

NIST: Unit Conversion

Official overview of conversion-factor use, rounding, and general unit-conversion guidance.

Oz to cups FAQ

How many cups is equal to 8 oz?: If oz means U.S. fluid ounces, 8 oz equals 1 U.S. cup.
How many oz to a cup?: In this page's U.S. volume system, 1 U.S. cup equals 8 U.S. fluid ounces.
How much is 3 oz to a cup?: 3 U.S. fluid ounces equals 0.375 U.S. cup, or three-eighths of a cup.
Is 16 oz 2 cups?: Yes. If oz means U.S. fluid ounces, 16 oz equals 2 U.S. cups.
How much is 4 oz to a cup?: 4 U.S. fluid ounces equals 0.5 U.S. cup, or one-half cup.
Does oz here mean fluid ounces or weight ounces?: This page treats oz as fluid ounces because the page is about volume conversion, not weight conversion.
Are these U.S. cups or metric / imperial cups?: This first version uses U.S. cups and U.S. fluid ounces so the rule stays fixed and unambiguous.

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