Uncut here, covers full when soft and decreases from there. When full hard though, I'd say maybe a third is showing.
No joke I actually went to the Dr about this yesterday! I think I have a fairly tight foreskin, and when full hard, if I push it all the way back over head, it's not the most comfortable thing in the world... So bloody embarrasing at Dr's, obviously I had to show them, and my lil man down below has a mind of its own and had to show the Dr the problem with a full hard on (woops!). So embarrassing - but truth be told the problem is only when I've got one, so I guess it wasn't too bad... But, still bad (embarrassing) enough! lol