The Engineer's Ephemeris

PCD Coordinate Calculator

The PCD (Pitch Circle Diameter) Coordinate Calculator is a powerful online tool that quickly generates accurate hole positions for circular bolt patterns, essential for CNC machining, fabrication, and mechanical design. To use it, simply enter the number of holes, the Pitch Circle Diameter (PCD), and the start angle. The start angle is measured anticlockwise from the 3 o’clock position (0° reference), giving you full control over where the first hole is placed. With one click on Calculate, the tool instantly provides precise X-Y coordinates and polar coordinates for every hole, eliminating the need for manual trigonometric calculations.

Coordinates will be displayed here.