True Position Visual Analyzer

Calculate true position and instantly see if the feature is within tolerance

What This GD&T True Position Calculator Does

This GD&T True Position Calculator helps you determine whether a feature location is within the specified tolerance zone.

It automatically calculates:
• Radial deviation from the nominal (basic) position
• True position (diametrical value)
• Pass or fail result based on tolerance

This version uses RFS (Regardless of Feature Size), meaning no bonus tolerance is applied. The tolerance zone remains constant regardless of feature size.

This tool is ideal for machinists, inspectors, and engineers who need quick and reliable position checks directly from drawing values.

How to Use This Tool

Enter the nominal (basic) X and Y position
Enter the actual measured X and Y position
Input the position tolerance (Ø value)
Click Calculate

The tool will instantly display radial deviation, true position, and pass/fail status.

Understanding True Position (RFS Condition)

True position defines how far a feature is from its exact theoretical location.

• The tolerance is a diametrical zone (circular area)
• The feature must fall inside this zone to pass
• Radial deviation is calculated from X and Y differences
• True position = 2 × radial deviation

Since this is RFS (Regardless of Feature Size):
• No bonus tolerance is added
• Feature size does not affect the tolerance
• The tolerance zone remains fixed

Example

Basic position: (1.000, 0.500)
Actual position: (0.995, 0.500)
Tolerance: Ø0.010

Result:
Radial deviation = 0.0050
True Position = Ø0.0100
Status = PASS

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