I use the Machinery Handbook or my Machinist Calc Pro 2 for these numbers. There are formula's that get you close, such as:
(.01299 x % of thread) / threads per inch. Subtract this from the major diameter.
Here's a link to a calculator you can use.
http://academic.evergreen.edu/projects/biophysics/technotes/fabric/js-tap.htm#tpi
Problem is, there is no perfect formula for depth of cut using a single point tool. It can get you close, but for final cut, you have to use the part it will fit to, a test bolt, or plug gage. With this said, a trick I learned on the PM forum:
Use the tap drill called out in MH or any other source for the bore, after that is done. I then cut a counter bore about .100" deep in the end of my thread area that is .002-.004 smaller than the major diameter. This is my final gage diameter. As you come up on your final cut, as soon as the tool marks the counterbore, you are at size, make a spring cut and it will be close fit, a second spring will loosen it up.
Edit: If you are cutting NPT than it's a different ballgame.