How do you determine deck clearance in an engine using math?

I have fuzzy memories about this subject...
There have been guys that post about this or speak of it but I don't recall how it is calculated.
Lets say that you know a published deck height of an engine, the stroke, the rod length and piston compression height. What is the formula to get an estimate on where the piston will be at TDC?
Part of my curiosity stems from my recent experiences shopping for pistons.
The KB 107 has a compression height of 1.675. The Speed Pro H116 CP has a height of 1.660 meaning the KB is .015 taller.
Can you spill the details of how to figure this?