The beginning of an Experience table:
(This is not total xp needed for the level, it is XP needed from the last level.)
Barbarian:
5
50
100
180
450
875
1850
3850
5750
7000
Knight:
5
40
75
150
400
900
1500
2750
5000
8500
Ranger:
5
40
70
165
400
800
1500
3000
5500
8500
Thief:
5
30
75...