What is the difference between fluid ounce (UK) and fluid ounce (US)?

The fluid ounce (UK) is based on the British imperial system and equals exactly 28.4130625 millilitres, while the fluid ounce (US) is part of the US customary system and equals exactly 29.5735295625 millilitres.

Why should I convert between fluid ounce (UK) and fluid ounce (US)?

Conversion is important to accurately interpret volumes in recipes, beverage servings, pharmaceutical labels, and legal documents when switching between British imperial and US customary measurements.

Can I assume fluid ounce (UK) and fluid ounce (US) are interchangeable?

No, because they represent slightly different amounts, assuming equivalence can lead to errors in volume measurement.

How to Convert from Fluid Ounce (UK) to Fluid Ounce (US)

Learn how to convert liquid volumes between fluid ounce (UK) and fluid ounce (US) units commonly used in British imperial and US customary systems, including practical examples and tips.

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

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

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

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

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

Explore More Volume Units Converter

What Is This Tool?

This tool helps you convert liquid volume measurements from fluid ounce (UK), used in the British imperial system, to fluid ounce (US), part of the United States customary system. It facilitates accurate interpretation of volumes across different measurement conventions.

How to Use This Tool?

Enter the volume value in fluid ounce (UK)
Select fluid ounce (UK) as the source unit
Choose fluid ounce (US) as the target unit
Start the conversion to view the equivalent volume in fluid ounce (US)

Key Features

Conversion between fluid ounce (UK) and fluid ounce (US) volume units
Precise unit definitions based on imperial and US customary standards
Examples demonstrating typical conversions for practical use
Browser-based and easy to use for culinary, pharmaceutical, and beverage applications

Examples

5 fluid ounce (UK) converts to approximately 4.8038 fluid ounce (US)
10 fluid ounce (UK) converts to approximately 9.6076 fluid ounce (US)

Common Use Cases

Converting traditional British recipe volumes to US measurements
Interpreting beverage service measurements between UK and US standards
Understanding pharmaceutical labeling and legal documents referencing imperial volumes
Assisting scientific and engineering calculations involving liquid volumes

Tips & Best Practices

Always confirm which fluid ounce unit is referenced before converting
Use the tool for culinary, beverage, or pharmaceutical contexts to ensure clarity
Be aware of slight volume differences to avoid assumptions of equivalence
Apply conversions when interpreting international product labels or recipes

Limitations

Fluid ounce (UK) and fluid ounce (US) measure slightly different volumes
Directly assuming these units are equal causes minor inaccuracies
Rounding during conversion may lead to small errors in sensitive contexts
Not all settings allow interchangeable use of UK and US fluid ounces

Frequently Asked Questions

What is the difference between fluid ounce (UK) and fluid ounce (US)?: The fluid ounce (UK) is based on the British imperial system and equals exactly 28.4130625 millilitres, while the fluid ounce (US) is part of the US customary system and equals exactly 29.5735295625 millilitres.
Why should I convert between fluid ounce (UK) and fluid ounce (US)?: Conversion is important to accurately interpret volumes in recipes, beverage servings, pharmaceutical labels, and legal documents when switching between British imperial and US customary measurements.
Can I assume fluid ounce (UK) and fluid ounce (US) are interchangeable?: No, because they represent slightly different amounts, assuming equivalence can lead to errors in volume measurement.

Key Terminology

Fluid ounce (UK): A volume unit equal to 1/160 of an imperial gallon, exactly 28.4130625 millilitres, used in the British imperial system.
Fluid ounce (US): A volume unit equal to 1/128 of a US liquid gallon, exactly 29.5735295625 millilitres, used in the United States customary system.
Unit Conversion: The process of changing a quantity expressed in one measurement unit to another unit within the same measurement category.

Quick Knowledge Check

What does 1 fluid ounce (UK) equal in fluid ounce (US)?

1.043 fluid ounce (US)

0.9607599404 fluid ounce (US)

1.000 fluid ounce (US)

Which system does fluid ounce (UK) belong to?

United States customary system

British imperial system

Metric system

Which use case is typical for fluid ounce (US)?

Labeling traditional British pharmaceutical products

Measuring ingredient volumes in US recipes

Serving beer in historical UK pubs

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