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US Fluid Ounces to UK Fluid Ounces (fl oz to imp fl oz) Converter

1 US fluid ounce (fl oz) = 1.04084 UK fluid ounces (imp fl oz). To convert US fluid ounces to UK fluid ounces, multiply by 1.04084: 12 fl oz × 1.04084 = 12.4901 imp fl oz.

1 fl oz = 1.0408427321 imp fl oz
Convert the other way: UK Fluid Ounces to US Fluid Ounces

Quick facts

How to convert US fluid ounces to UK fluid ounces

  1. Write down the number of US fluid ounces you have.
  2. Multiply it by 1.04084 (the number of UK fluid ounces in one US fluid ounce).
  3. Round the result to the precision you need.
imp fl oz = fl oz × 1.04084

Worked example (a can of soda): 12 fl oz × 1.04084 = 12.4901 imp fl oz.

To convert UK fluid ounces back to US fluid ounces, multiply by 0.96076, or divide by 1.04084.

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

US Fluid Ounces to UK Fluid Ounces conversion table

US Fluid Ounces to UK Fluid Ounces conversion table
US Fluid Ounces [fl oz]UK Fluid Ounces [imp fl oz]
0.01 fl oz0.0104084273 imp fl oz
0.1 fl oz0.1040842732 imp fl oz
1 fl oz1.0408427321 imp fl oz
2 fl oz2.0816854642 imp fl oz
3 fl oz3.1225281963 imp fl oz
5 fl oz5.2042136605 imp fl oz
10 fl oz10.4084273211 imp fl oz
20 fl oz20.8168546421 imp fl oz
50 fl oz52.0421366053 imp fl oz
100 fl oz104.0842732106 imp fl oz
1000 fl oz1040.8427321061 imp fl oz

fl oz to imp fl oz chart from 1 to 100

UK Fluid Ounces to US Fluid Ounces conversion table

UK Fluid Ounces to US Fluid Ounces conversion table
UK Fluid Ounces [imp fl oz]US Fluid Ounces [fl oz]
0.01 imp fl oz0.0096075994 fl oz
0.1 imp fl oz0.0960759939 fl oz
1 imp fl oz0.9607599392 fl oz
2 imp fl oz1.9215198784 fl oz
3 imp fl oz2.8822798176 fl oz
5 imp fl oz4.8037996959 fl oz
10 imp fl oz9.6075993919 fl oz
20 imp fl oz19.2151987837 fl oz
50 imp fl oz48.0379969593 fl oz
100 imp fl oz96.0759939186 fl oz
1000 imp fl oz960.7599391856 fl oz

US Fluid Ounces vs UK Fluid Ounces

US Fluid OunceUK Fluid Ounce
Symbolfl ozimp fl oz
Equals1 fl oz = 1.04084 imp fl oz1 imp fl oz = 0.96076 fl oz

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.

What is a UK fluid ounce?

A UK imperial unit equal to 1/20 of an imperial pint (exactly 28.4130625 ml). Used in the UK and Canada on older recipes, drinks measures and some bottle labels.

Where You Will Meet US Fluid Ounces and UK Fluid Ounces

US fluid ounces are used mainly in the United States, while UK fluid ounces are used mainly in the UK (pub pints, fuel economy in mpg) and older Canadian recipes. This conversion bridges the US customary and metric systems, so it comes up whenever a figure crosses the US border with Canada or the Atlantic with the UK: product specifications, travel, recipes, school work and trade.

How big is 1 fl oz compared with 1 imp fl oz?

1 fl oz is 1.04084 times the size of 1 imp fl oz, so the number gets bigger when you convert US fluid ounces to UK fluid ounces. The two are close in size: 1 fl oz is about 4.08% larger than 1 imp fl oz, which is easy to miss.

US Fluid Ounces to UK Fluid Ounces without a calculator

Real-world fl oz to imp fl oz examples

Everyday US fluid ounces and UK fluid ounces
ExampleUS Fluid OuncesUK Fluid Ounces
A can of soda12 fl oz12.4901 imp fl oz
A US pint glass16 fl oz16.6535 imp fl oz
One cup8 fl oz8.32674 imp fl oz
A shot (jigger)1.5 fl oz1.56126 imp fl oz
One imperial pint19.2152 fl oz20 imp fl oz
Half a pint9.6076 fl oz10 imp fl oz
One imperial fluid ounce0.96076 fl oz1 imp fl oz

How exact is the fl oz to imp fl oz factor?

The factor is exact by definition, so any error comes only from rounding. For everyday use, 3 significant figures are plenty; for engineering or invoices, keep 5 or more.

Mistakes to avoid

What people convert next

Next, you might want uk fluid ounces to milliliters and us fluid ounces to milliliters. The full volume converter lists every unit.

On pakmath.com, the scientific calculator is a useful next step; Adzita offers a free macro calculator.

Frequently asked questions

How many UK fluid ounces are in a US fluid ounce?

There are 1.04084 UK fluid ounces in 1 US fluid ounce (1 fl oz = 1.0408427321 imp fl oz).

How many US fluid ounces are in a UK fluid ounce?

There are 0.96076 US fluid ounces in 1 UK fluid ounce (1 imp fl oz = 0.9607599392 fl oz).

How do I convert US fluid ounces to UK fluid ounces?

Multiply the number of US fluid ounces by 1.04084. For example, 10 fl oz × 1.04084 = 10.4084 imp fl oz. To convert back, multiply by 0.96076.

What is 10 fl oz in UK fluid ounces?

10 fl oz = 10.4084 imp fl oz.

What is 100 fl oz in UK fluid ounces?

100 fl oz = 104.084 imp fl oz.

Is the fl oz to imp fl oz 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.

What is an easy way to convert US fluid ounces to UK fluid ounces?

In your head: multiply by 1 (about 3.9% off). 12 fl oz × 1 ≈ 12 imp fl oz.

How many UK fluid ounces is 12 fl oz (a can of soda)?

12 fl oz = 12.4901 imp fl oz.

How many US fluid ounces is one imperial pint (20 imp fl oz)?

20 imp fl oz = 19.2152 fl oz.

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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