Description

This article is from the Beer and Other Brewing FAQ, by Kurt Swanson ksw@dna.lth.se with numerous contributions by others.

29. How do I convert from US to UK measures, and vice-versa?

There are two inherent differences between US and Imperial (British)
liquid measure:

     1: ounce - US = 29.573 ml,   Imperial = 28.412 ml
     2: gill  - US = 4 US ounces, Imperial = 5 UK ounces

For both systems there are 4 gills in a pint, 2 pints in a quart,
and 4 quarts in a gallon. Thus

     (UK gallon)        28.412 * 5
                        ---------- = 1.2009     (ratio UK->US gallon)
     (US gallon)        29.573 * 4

That is to say, for all units above the ounce, the Imperial or British
variant is almost exactly 20% larger than the corresponding US unit.

 

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