Use these calculators to find the PCD (pitch circle diameter) of a series of holes if you have a very large PCD or an odd number of holes (where you cannot measure over opposing holes).
Two calculators are provided, the first if you can insert pins into the holes and the second if you can measure the holes directly.
You can use a vernier caliper or tape measure to take your measurements, but bare in mind the more accurate your measurements, the more accurate the results will be.
If you need co-ordinates for a known PCD, please use our Hole-Co-Ordinate Calculator
PCD CALCULATOR WITH MEASUREMENT IN HOLES
Input your values and select your units as required.