php game, formula to calculate a level based on exp

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Im making a browser based PHP game and in my database for the players it has a record of that players total EXP or experience.

What i need is a formula to translate that exp into a level or rank, out of 100.

So they start off at level 1, and when they hit say, 50 exp, go to level 2, then when they hit maybe 125/150, level 2.

Basically a formula that steadily makes each level longer (more exp)

Can anyone help? I'm not very good at maths :P

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