Was thinking about this question and the calculating of my monthly profit. (CDT=Coin per Day per Th/s.) Month CDT 0.00011977.
0.00011977 x Your th/s speed x 30 days (april month) = My profit? Or am i wrong?
You cannot use last month's CDT to calculate future payouts. It all greatly depends on network difficulty and luck, and some other factors. Usually (as I see it), the CDT gets lower each month as network difficulty increases. Look at the year CDT shown at minergain - it's almost 3 times higher than the CDT for March, and March itself was a very good month talking about luck and corresponding rewards!