Nice Board, I dont think most traders really understand the benefit of this.
I too have a Cost Averaging Calculator. Very Similar to yours but a little easier and more informative.
Only Enter in Values in the GREEN cells.
Your cost and number of shares each time you buy and what your sell target is.
The rest will autocalculate. http://putstuff.putfile.com/75371/7938030
Let me know if anyone has any questions.
In the example, lets say you purchased 10000 shares of XYZ company at .07 and you pay $29 trading fee.
So you enter in 729 and 10000 shares.
You can see that if you sell at .06 then you will be down 129 bucks or 17.7%
If you were able to buy today at .05 you could purchase 20000 more shares for $1029.
(enter 1029 and 20000 in the second buy row)
Now, if you sell at .06 you end up out with $42 profit
You can play around with your sell target number and get a good idea for how Averaging down (or up) can work to your advantage.