Math Formula

[Sephalo]

Hey there.

I'm making a formula to calculate crit chance in my ORPG but am not good enough at math to make a good formula for it and was wondering if someone could make a good formula for me.

Info:
Class levels are from 1 to 40 so it has to be for 40 levels.

Vitality increases the crit chance by 133/150 (0.8866666) per level and Agility increases the crit chance by 133/300 (0.443333333) per level.

I could make a simple formula like this:
Critchance in % = (0.8866666Vitality + 0.44333333Agility) / Level

The problem with this formula is when a unit has 10% crit at level 1 and he levels up it immediatelly goes to 5% crit chance and that's a too big chance! But eventually when he's at level 40, 40 Vitality + 40 Agility should give him 1.33% critchance like it would do in that simple formula I made.

So I was wondering if someone would like to make a formula out of this that decreases the critchance pretty slow in the beginning, fast in the middle and slow in the end again so a formula would look like this:

Is this possible?;p

 

[ike_ike]

A cubic crit?

 

[Maker]

Is this crit chance a chance for your unit to crit or be critted? What is the base crit chance, and what is the maximum crit chance?

 

[Sephalo]

I'm sorry guys, thanks for help but after alot of brainstorming RaiN and me came up with something.