Why is the US cup volume different in nutrition labeling?

Some US nutrition labels use a 'legal' cup defined as 240 mL, which is slightly different from the customary volume of 236.5882365 mL.

Where is the UK fluid ounce still commonly used?

The UK fluid ounce is mainly found in traditional British recipes, historical documents, and some beverage service contexts.

Can I use this converter for scientific measurements?

While this tool converts volume units, scientific practice usually prefers milliliters or liters instead of UK fluid ounces.

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

Learn how to convert volume measurements from US customary cups to UK imperial fluid ounces accurately, useful for cooking, baking, and legal contexts.

Cup (US)

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

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

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

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

Explore More Volume Units Converter

What Is This Tool?

This converter helps you transform volume values measured in US customary cups to UK imperial fluid ounces. It is designed for accuracy when adapting recipes, labels, or legal documents between these measurement systems.

How to Use This Tool?

Enter the value in cup (US) you want to convert.
Select the target unit as fluid ounce (UK) [fl oz (UK)].
Click the convert button to get the equivalent volume in fluid ounces (UK).

Key Features

Converts volumes from cup (US) to fluid ounce (UK) [fl oz (UK)] using a precise conversion rate.
Supports applications in cooking, baking, beverage service, and interpreting historical or legal volume measures.
Browser-based and easy to use with simple input and output for quick conversions.

Examples

2 cup (US) equals 16.6534836926 fluid ounce (UK) [fl oz (UK)].
0.5 cup (US) equals 4.16337092315 fluid ounce (UK) [fl oz (UK)].

Common Use Cases

Converting US recipes to British measurement units for cooking and baking accuracy.
Using imperial volumes in beverage service and bartending in the UK.
Interpreting historical, legal, or pharmaceutical documents referencing UK fluid ounces.

Tips & Best Practices

Always verify the definition of the US cup used, as nutrition labeling may define it slightly differently.
Use this conversion to ensure consistent volume measures when moving between US and UK culinary contexts.
Be aware that milliliters often replace UK fluid ounces in scientific and engineering practices.

Limitations

Unit definitions between US and UK volumes differ, which can cause slight inaccuracies if conversion is neglected.
The US cup size varies between customary use and nutrition labeling standards.
The UK fluid ounce is less commonly used today, potentially limiting relevance in modern scientific settings.

Frequently Asked Questions

Why is the US cup volume different in nutrition labeling?: Some US nutrition labels use a 'legal' cup defined as 240 mL, which is slightly different from the customary volume of 236.5882365 mL.
Where is the UK fluid ounce still commonly used?: The UK fluid ounce is mainly found in traditional British recipes, historical documents, and some beverage service contexts.
Can I use this converter for scientific measurements?: While this tool converts volume units, scientific practice usually prefers milliliters or liters instead of UK fluid ounces.

Key Terminology

cup (US): A US customary unit of volume equal to 8 US fluid ounces or exactly 236.5882365 milliliters, commonly used in cooking and food labeling.
fluid ounce (UK) [fl oz (UK)]: A UK imperial unit of liquid volume equal to 1/160 of an imperial gallon or 28.4130625 millilitres, used historically in British measurement systems.
Conversion Rate: The factor used to transform a volume in cup (US) to fluid ounce (UK), which is 1 cup (US) = 8.3267418463 fluid ounce (UK).

Quick Knowledge Check

What is the volume of 1 US cup in UK fluid ounces?

Exactly 28.4130625 UK fluid ounces

8.3267418463 UK fluid ounces

1/160 of an imperial gallon

Why might US cup measurements vary in different contexts?

Because of regional temperature differences

Due to a 'legal' cup size of 240 mL in nutrition labeling

Because the UK fluid ounce definition differs

In which situation is converting cup (US) to fluid ounce (UK) most useful?

Only for scientific lab experiments

Adapting US recipes to British home cooking

Measuring dry weight ingredients precisely

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