Often the points needed to gain a level is based on a curve. In a lot of RPGs were there are also a lot of other characteristics and attributes of your character that increase with your level, they will also be on there own curves.

Take a look at RPGMaker to see how they do things. Specifically look at the parameter curves in the screenshots of the "Add Some Uniqueness to by Customizing Starting Equipment" section of the Creating a Main Character document.

Often the points needed to gain a level is based on a curve. In a lot of RPGs were there are also a lot of other characteristics and attributes of your character that increase with your level, they will also be on there own curves.

Take a look at RPGMaker to see how they do things. Specifically look at the parameter curves in the screenshots of the "Add Some Uniqueness to by Customizing Starting Equipment" section of the Creating a Main Character document.

Basically you might have a curve for how much XP is needed to levelup, then different curves for how much HP, MP, stamina, strength etc is gained each level.