What is one US cup in fluid ounces?

One US cup equals exactly 8 US fluid ounces.

Why might the US cup volume vary?

The US cup can vary slightly because some nutrition labeling uses a 'legal' cup defined as 240 milliliters instead of the standard 236.5882365 milliliters.

Is the US cup the same as the metric cup?

No, the US cup differs from the metric cup, so conversions should be done carefully when working internationally.

How to Convert from Cup (US) to Fluid ounce (US) [fl oz (US)]?

Convert volume measurements from US cups to US fluid ounces easily with this online unit converter. Ideal for cooking, baking, and accurate liquid measurement.

Cup (US)

Fluid ounce (US) [fl oz (US)]

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Cup (US) to Fluid ounce (US) [fl oz (US)] Conversion Table

Cup (US)	Fluid ounce (US) [fl oz (US)]

Custom Unit Conversion Table Generator – Instant Printable Conversion Tables

Start Value

Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.

End Value

Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.

Interval

Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.

Cup (US) to Fluid ounce (US) [fl oz (US)] Conversion Table
Cup (US)	Fluid ounce (US) [fl oz (US)]

Explore More Volume Units Converter

What Is This Tool?

This online converter transforms volume values from US customary cups to US fluid ounces. It's designed to assist with culinary measurements, product labeling, and everyday volume conversions.

How to Use This Tool?

Enter the volume amount in US cups you want to convert.
Select 'cup (US)' as the input unit and 'fluid ounce (US) [fl oz (US)]' as the output unit.
Click the convert button to see the equivalent volume in fluid ounces.

Key Features

Converts US customary cups to US fluid ounces accurately based on standard conversion rates.
Shows conversion examples for easy understanding of volume equivalences.
Suitable for cooking, baking, nutrition labeling, and packaging measurements.
Simple browser-based tool that requires no downloads or installations.

Examples

2 Cups (US) equals 16 Fluid ounce (US) [fl oz (US)]
0.5 Cup (US) equals 4 Fluid ounce (US) [fl oz (US)]

Common Use Cases

Measuring liquid and dry ingredients in US recipes including milk, flour, and sugar.
Home baking and cooking where precise volume measurements are critical.
Nutrition labeling on US dietary guidance and food packaging.
Converting ingredient volumes for beverage and bottled product labels.
Measuring small liquid quantities for medicine or household products.

Tips & Best Practices

Verify whether the recipe or packaging uses the standard 236.5882365 mL cup or the 'legal' 240 mL cup variant.
Be cautious when converting measurements internationally due to differences in cup sizes.
Use fluid ounces to obtain finer volume measurements when precision is needed.
For scientific accuracy, consider converting to milliliters or liters when appropriate.

Limitations

Slight volume differences exist between the standard US cup and the legal cup defined as 240 mL.
Other cup definitions like the metric cup differ and require careful use in international contexts.
Milliliters or liters may be preferable for scientific measurements requiring high precision.

Frequently Asked Questions

What is one US cup in fluid ounces?: One US cup equals exactly 8 US fluid ounces.
Why might the US cup volume vary?: The US cup can vary slightly because some nutrition labeling uses a 'legal' cup defined as 240 milliliters instead of the standard 236.5882365 milliliters.
Is the US cup the same as the metric cup?: No, the US cup differs from the metric cup, so conversions should be done carefully when working internationally.

Key Terminology

cup (US): A US customary unit of volume equal to 8 US fluid ounces or approximately 236.5882365 milliliters, used mainly for measuring culinary ingredients.
fluid ounce (US) [fl oz (US)]: A US customary volume unit equal to 1/128 of a US liquid gallon or exactly 29.5735295625 milliliters, used for measuring small liquid volumes.
legal cup: A cup measurement defined as 240 milliliters primarily used in US nutrition labeling.

Quick Knowledge Check

How many US fluid ounces are in one US cup?

4 fluid ounces

8 fluid ounces

16 fluid ounces

The 'legal' US cup used in nutrition labeling is defined as:

236.6 milliliters

240 milliliters

250 milliliters

Which unit is commonly used for small liquid volume measurements in the US?

Cup (US)

Fluid ounce (US)

Liter

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