How many skinll trees can I fully fill in Skyrim?

When I reach the max level in skyrim, and bought and upgraded all the perks in select trees, how many trees could i max out?How many skinll trees can I fully fill in Skyrim?
I heard you'd have to make it to level 250 or so to fill them all
Max level is actually 80 or 81 with all skills at 100 Level 50 is just the last level based achievement

so you can get 80-81 perks out of the 250 but some are quite useless like most of the lockpick and pickpocket skills

My link to where I got my information is http://www.uesp.net/wiki/Skyrim:Leveling

And here are some useful websites to use while playing Skyrim as well (links in source)How many skinll trees can I fully fill in Skyrim?
The max LV isn't 50, but the max perks you can activate are 50. Not all skill trees have the same amount of perks, so it depends on what skill trees you fill. Not all skill trees and completely worth filling either.



I'm focusing on smithing Heavy Armor, so I won't active the perks to smith Light Armor, just an example.



So you can active a total of 50 perks.
Max level: 50

Points per level: 1



Right?



And i believe each skill tree has a different amount of total points consumed when full?How many skinll trees can I fully fill in Skyrim?
Who knows. Some are not worth getting getting all the perks in a tree. Best example is lockpicking.