Flatness Tolerance Calculator

Inputs

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Height of probed point 1 relative to a best-fit or reference plane.
mm
Height of probed point 2. Leave blank if unused.
mm
Height of probed point 3. Leave blank if unused.
mm
Height of probed point 4. Leave blank if unused.
mm
Height of probed point 5. Leave blank if unused.
mm
The flatness tolerance from the feature control frame — the allowed width of the parallel-plane zone.
mm

Results

Default result
Edit inputs
Flatness
0.05mm
Pass

Within tolerance.

Range of your points: the gap between the two containing parallel planes.

Also computed

Highest point0.05mm

Maximum measured reading.

Lowest point0mm

Minimum measured reading.

Method notes 3 notes
  • Flatness is the total range of the surface: the distance between the two parallel planes that just contain every measured point (max − min).
  • Flatness is a form control — it references no datum. The result is unchanged by how the part is oriented.
  • Passes when the flatness is within the flatness tolerance (the allowed width of the parallel-plane zone).

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