Oh I see. Well find out what your avg # of hands is per hour, then look on that graph that C9 posted(ironic that that was posted just the other day, I haven't been on PTR for 3 days, so I was surprised to see that)
Then plug into the formula:
(Approx. # Hands an hour)/100 * (Number on grid from PTR) = Your Hourly Rake
If you're playing 5 hours a day, then just multiply that number by 5 and you've got your daily.
To get weekly, just multiply your daily by 7.
So on, so on.
So let's say you play about 75 hands an hour on 16 tables, that would be 1,200 hands that you're playing an hour. Let's also say you're playing on Stars which at 2NL is paying .20 per 100 hands in rake.
(1,200/100)*.2 = $2.40 Hourly rake
2.40*5 = $12 Daily Rake
12*7 = $84 Weekly Rake
84*4 = $336 Monthly Rake
336*12 = $4,032 Yearly Rake
4,032*100 = $403,200 Century Rake
Granted these are all approximations because they are using the average rake a player gets hit with at a given site, but if your pots are bigger then you're going to get hit with more rake than if your pots are small.