it seems to me that you are looking at the wrong information. The amount of money you can make per month is directly related to the stakes you play x the number of hands you play per month x your winrate. What you really need to figure out your winrate and the rest shoudl be pretty easy.

Average winrate is calculated differently for the various games. Cash games use bb(or ptbb) per 100 hands. Most tourneys use ROI and ITM%.

I would suggest that you find out the standard winrate at the stakes you are playing and see if you are winning that that rate. You can then use the above calculation to determine how much you need to play to make the amount of money you need.