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How to Calculate True Position

From time to time in machining and inspection you may have to calculate the true position tolerance.

It’s actually done by the following True Position Calculation Formula:

XVAR = The deviation amount from the basic dimension in the X axis.

YVAR = The deviation amount from the basic dimension in the Y axis.

SQRT = Square Root


True Position Tolerance = 2 x  SQRT(XVAR² + YVAR²)


We have a hole that has a True Position Tolerance Call Out of .008 to Datum A and Datum B.

After measuring the hole location we find that it is .002” off from Datum A and .003” off from Datum B.  So we enter the variance dimensions into our True Position Formula.

2 x SQRT(.002² + .003²) = 2 x SQRT(.000004 + .000009)

2 x SQRT(.000013) = 2 x .003605551 = .0072

We are just barely within the True Position Tolerance of .008

As you can see True Position Calculating can be a daunting problem to solve.

Fortunately there is an easy to use software program available that can do the calculations for you!  Saving you time and money!

Watch This Video First.  You will be glad that you did…

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