# Reliability S

> [HTML Version](reliability_s.html)

As default, the bearing life is calculated for a reliability of 90%. The required reliability can be changed here with limits 90% and <100%. The life modification factor for reliability 'fac' is calculated according to this input using either the three parameter Weibull relationship as given as formula in [ISO/TR 1281-2](bibliography.md#iso_tr_1281-2) or the two parameter Weibull relationship used in [ISO 3408-5](bibliography.md#iso_3408-5).