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Planar Position Deviation and Bonus

Calculate diametric planar position deviation and optional bore or shaft material-condition bonus.

  • Formula & worked example
  • Private in your browser
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

A center measured at (13 mm, 14 mm) relative to its intended (10 mm, 10 mm) has 10 mm diametric deviation. A supplied 12 mm RFS position tolerance leaves 2 mm margin.

Position deviation = 2√((measured x−true x)²+(measured y−true y)²); allowed deviation = positional tolerance + material-size bonus.

Worked example

Enter these known values and leave the other values blank.

Material condition
RFS (regardless of feature size)
Distance from datum B
10 mm
Distance from datum C
10 mm
Distance from datum B
13 mm
Distance from datum C
14 mm
Position tolerance (diametrical)
12 mm
Offset from datum B
3 mm
Offset from datum C
4 mm
Position variation
10 mm
Drawing position tolerance
12 mm
Tolerance excess
2 mm

Assumptions and limitations

  • This planar arithmetic assumes a diametric tolerance zone and the supplied material-condition callout. It does not establish datum alignment or full geometric inspection compliance. Captured coordinate controls require positive coordinates; translate the origin consistently if needed. Measured size must lie between the supplied size limits.
  • Select compatible units and clear the quantity to solve before supplying the remaining measurements. Rounded purchase counts cannot uniquely recover a continuous dimension. Currency choices label amounts and do not convert exchange rates.

Common questions

How can I solve for a missing measurement?

Clear that field, then enter independent known values. Lock a known measurement to preserve it while changing another value. Procurement counts are rounded upward and cannot be reversed uniquely.

References

Enforce the stated physical and discrete input domains.

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