The sizes of Kelly Kettles is indeed confusing on the sites. British pint is 20 oz, so the kettles should be 20 oz and 50 oz. I have measured the 20 oz (see my review) but have not seen the large kettle, but would guess it to be 50 oz.

The various sites seem to not realize that British pints and US pints are different. Thanks to King George III who wanted to raise taxes on Colonial beer pints, but found he needed an act of Parliment to do that but only needed a royal decree to decrease the unit of measure effectively raising the tax. I always get Imperial pints in our taverns.....no way I am paying the increased tax!