D = Difficulty (Reference for values below)
B = Reward per Block (Reference for value below)
N = Number of days per month (default = 30)
S = Number of seconds per day (S = 60 * 60 * 24 = 86400)
http://i.stack.imgur.com/aqXbM.png
Now what you need is looking at the current average total hashing power per day.
I am assuming that the result is a per second rate?
If so, I then need to multiple that result by 60 to get the per minute result, then by 60 again to get the per hour. That toal then needs to be multiplied by 24 to get the per day.
That sound right?
I worked it out and the number seems awfully large. I assume that is the result of solo mining? How would a pool work into the formula?