Quick Question about Health?

i have been looking in the post and could not find anything about your health bar. Anyways u start off with 100 health and u get 20 health a lvl right? so at the end ( lvl 20 ) u should have 500 health with nothing taking it down (Super or major runes) or nothing bring it up (staff,sword,axe........) if im right about all of this then why does my Ranger only have 480 health at lvl 20? with nothing on..

You're forgetting that to arrive at level 20, you only level up 19 times.

100 base health + (19 levels * 20 health/level) = 480