I am sure someone out there could create a calculator to make people more comfortable. I found the process to much like finding ones Alk or Cal daily dosing amount. You mix up your solution and start with a small amount to see what your tank uses and go from there. I am actually glad @twilliard kept it simple.
I was talking about stuff that's already in this thread. You made my point though...even folks promoting this thread don't know about some of the great stuff in it.
One of our members created a spreadsheet based calculator, then put it on Google Docs. Then someone linked another calculator from elsewhere. So the ifo is already here. Just sorta hidden.
It's not a question of keeping it simple, it's a question of not allowing the info to remain hidden.