What is the amount of exp to level up from level 14 to level 15?

Mouse over the exp bar under the header. It tells you how much is left.

I couldn't tell you off the top of my head

I need to know this beacause I want to know if the player you banned (Man of DOOM) will decrease in his level when, or if, you will unban him.

We are not at liberty to discuss another account with the holder of another account. However he will lose his level after getting enough attacks and then when he goes inactive I will also attack him