Fit tolerance calculator
Enter hole/shaft deviations (μm, ISO 286-2) → max/min clearance or interference + fit type.
How to use
- Enter the calculation conditions
Enter the dimensions, loads, speeds or operating conditions requested by the form.
- Run the calculation
The tool applies the formulas shown on this page to the entered values.
- Review the result
Review the resulting specification and checks, then verify them against the cited source, current standard and real operating conditions before use.
Core formula
D_max = D + ES/1,000; D_min = D + EI/1,000
Example using default values
D_max = 30 + 21/1,000; D_min = 30 + 0/1,000 → 30–30.021 mm (IT = 21 μm)
Source: ISO 286-1 / ISO 286-2 / JIS B 0401.
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