Fellow photographer Yuri Arcurs has created a neat tool for having your profits calculated in a matter of seconds.
If you work with stock agencies and lost your income profit from each one of them you got to check out this.
As he explains in his blog page...
"The calculator will estimate the expected total income for that month.
How it works is simple. Just call up the calculator anytime, and enter your total (to date) for the month, on any of the sites. The calculator will quickly whip up what your projected monthly total will be.
You can easily customize the list of agencies by adding your own to the list by tapping the last field. You can save your list and recall it, all stored safely and your data will be not be shared. Not even I can see the data you type in."
You can find it here.
And if you do not know this great photographer take a look at his inside tour studio video here.