The largest living bird by wingspan is the Wandering Albatross (Diomedea exulans) of the sub-Antarctic oceans. The maximum dimensions in this species are a length of 1.44 m (4.7 ft) and a wingspan of 3.65 m (12.0 ft).
So that would give us 4:12 simplifying 4:12 is 1:3 which is 1/3 so I think. Your height is 1/3 of your wingspan? I'm 5 feet tall so my wingspan would be 15 feet? Also keep note my bones are hollowing out which will allow me to fly.
Any opinions?