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Drill Calc FAQ
iPhone Software for Drill Bit and Tap Calculations
To calculate the correct drill bit to use, select the bolt size by tapping on the current bolt, to bring up a list of available standard sizes. From this list, you can also switch between Inch and Metric units. Or you can directly enter in the tap diameter and threads per inch / pitch.
Next enter in the desired percent of thread. The ideal drill size will be calculated, and several standard drill sizes will be displayed, along with the error in hole size, and the theoretical percent thread for that size hole.
Clicking on Number will bring up a list of standard inch numbered drill bit sizes, 1 through 80 as well as A through Z. Clicking on Fractional will bring up a list of fractional drill sizes, from 1/64 to one inch.