International Tolerance Grade Calculator

This calculator works in line with ISO 286-1 (2010), ISO 286-2 (2010) and ANSI B4.2 (1978) standards which are based on metric units.

According to the input parameters of nominal size and hole/ shaft tolerances, the size limits and deviations for holes and shafts are calculated and the fit type is defined.

The preferred fits advised by ISO and ANSI standards can be found in the on our limits and fits page.

The tolerances defined in ISO 286-1 (2010) are applicable to size range from 0 mm to 3150 mm but there are a lot of exceptional cases defined in the standard which depend on tolerance selection.

If the calculation results given by the calculator are "---", then this means the input parameters are not applicable according to ISO standard.