Calculators for measuring bores

Hole calc provides calculators to help machinists, craftspeople, engineers and designers measure any bore diameter using three gage pins, or any other cylinders of known diameter. Questions? Read the guide

This calculator provides the diameter of a bore described by three gage pins. When "Tolerance" is selected, the result is a range determined by the class of gage pins used.

Diagram of bore and gages for three pin calculator