It's also hard to gauge size by weight as it also depends on build. For example we had fun at a TV interview promoting a local cat show by having my chubby round British Shorthair next to Trouble, the world's tallest domestic cat (F2 Savannah) and asking which weighed the most. They all chose Trouble as he towered over Georgie... but they weighed the same just Georgie's weight was in blubber and Trouble's is in legs 