That's a question I can answer, but I doubt that many others know. It took me exhaustive research to get this data. 
The original player (without Trinity) and the Swordsman and Ranger all have the same scale but the Conjurer marches to a different drummer. Everyone is equal for the first three levels and, after that, the Conjurer has more work to do for each level.
In the list that follows, the first number is the total experience required to reach that level if you are playing anyone except a Conjurer, and the second number is the requirement for our poor, overworked Conjurer.
Level 1.....50
Level 2.....120
Level 3.....220
Level 4.....360....Conjurer....370
Level 5.....560.....................590
Level 6.....840.....................920
Level 7.....1230...................1410
Level 8.....1780...................2140
Level 9.....2550...................3220
Level 10...3630...................4820
Level 11...5140...................7190
Level 12...7250...................10700
Level 13...10200.................15890
Level 14...14330.................23570
Level 15...20110.................34940
Level 16...28200.................51770
Level 17...39530.................76680
Level 18...55390.................113,550
Level 19...77590.................168,120
Level 20...108,670..............248,880
Level 21...183,260..............442,700
Level 22...287,680..............714,040
Level 23...538,290..............1,365,260
Level 24...1,139,750...........2,928,190
Level 25...2,583,260...........6,679,220
Level 26...6,047,680...........15,681,690
Level 27...14,362,290.........37,287,620
Level 28...34,317,352.........89,141,856
Level 29...82,209,504.........213,592,016
Level 30...197,150,656.......512,272,384
Level 31...473,009,440.......1,229,105,280
Level 32...1,135,070,464....(not available)
Level 32 is as high as you can go unless you are a Conjurer. Conjurers can never get past level 31 no matter how long you play. There are still numbers in the box to reach the next level but the numbers start doing crazy things. Even if you cheat and add 12 billion experience points you remain at level 31 forever.
Notice that at level 21 where you are, you have done almost two and a half times the work that a Swordsman would do to get to that level.
p.s.: Yes, I have characters in each class who have reached the top level and beyond without using external cheats. 
Playing each plugin (and several more in development) through several times with those characters certainly helped get me there.
p.p.s.: You cannot change the player's armor or weapons in the Wizard of War spell. The Wizard of War is just an illusion after all and doesn't really exist except in the mind of the Conjurer. 
