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

1 UK gallon (imp gal) = 153.722 US fluid ounces (fl oz). To convert UK gallons to US fluid ounces, multiply by 153.722: 25 imp gal × 153.722 = 3,843.04 fl oz.

1 imp gal = 153.7215902697 fl oz
Convert the other way: US Fluid Ounces to UK Gallons

Quick facts

How to convert UK gallons to US fluid ounces

  1. Take the value in UK gallons.
  2. Multiply it by 153.722 (the number of US fluid ounces in one UK gallon).
  3. Round the result to the precision you need.
fl oz = imp gal × 153.722

Worked example: 25 imp gal × 153.722 = 3843.04 fl oz.

To convert US fluid ounces back to UK gallons, multiply by 0.00650527, or divide by 153.722.

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

UK Gallons to US Fluid Ounces conversion table

UK Gallons to US Fluid Ounces conversion table
UK Gallons [imp gal]US Fluid Ounces [fl oz]
0.01 imp gal1.5372159027 fl oz
0.1 imp gal15.372159027 fl oz
1 imp gal153.7215902697 fl oz
2 imp gal307.4431805394 fl oz
3 imp gal461.1647708091 fl oz
5 imp gal768.6079513485 fl oz
10 imp gal1537.215902697 fl oz
20 imp gal3074.431805394 fl oz
50 imp gal7686.0795134849 fl oz
100 imp gal15372.1590269698 fl oz
1000 imp gal153721.5902696985 fl oz

imp gal to fl oz chart from 1 to 100

US Fluid Ounces to UK Gallons conversion table

US Fluid Ounces to UK Gallons conversion table
US Fluid Ounces [fl oz]UK Gallons [imp gal]
0.01 fl oz0.0000650527 imp gal
0.1 fl oz0.0006505267 imp gal
1 fl oz0.0065052671 imp gal
2 fl oz0.0130105342 imp gal
3 fl oz0.0195158012 imp gal
5 fl oz0.0325263354 imp gal
10 fl oz0.0650526708 imp gal
20 fl oz0.1301053415 imp gal
50 fl oz0.3252633538 imp gal
100 fl oz0.6505267076 imp gal
1000 fl oz6.5052670757 imp gal

UK Gallons vs US Fluid Ounces

UK GallonUS Fluid Ounce
Symbolimp galfl oz
Equals1 imp gal = 153.722 fl oz1 fl oz = 0.00650527 imp gal

What is a UK gallon?

The imperial gallon, defined as exactly 4.54609 litres (UK Weights and Measures Act 1985); about 20% larger than the US gallon. Used in the UK and Canada for fuel economy (miles per gallon), garden and aquarium volumes, and older fuel prices.

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.

Frequently asked questions

How many US fluid ounces are in a UK gallon?

There are 153.722 US fluid ounces in 1 UK gallon (1 imp gal = 153.7215902697 fl oz).

How many UK gallons are in a US fluid ounce?

There are 0.00650527 UK gallons in 1 US fluid ounce (1 fl oz = 0.0065052671 imp gal).

How do I convert UK gallons to US fluid ounces?

Multiply the number of UK gallons by 153.722. For example, 10 imp gal × 153.722 = 1,537.22 fl oz. To convert back, multiply by 0.00650527.

What is 10 imp gal in US fluid ounces?

10 imp gal = 1,537.22 fl oz.

What is 100 imp gal in US fluid ounces?

100 imp gal = 15,372.2 fl oz.

Is the 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.

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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