Bearing Life — ISO 281 Calculator

Basic rating-life calculation using the ISO 281 L10 relationship.

Dynamic load rating C (kN)Equivalent dynamic load P (kN)Speed (rpm)Exponent p (3 ball / 10/3 roller)Calculate

Equation

L10 = (C/P)^p million revolutions; L10h = 10⁶·L10 / (60·n)

Assumptions

Basic rating life only. Lubrication, contamination, temperature, reliability adjustment and static rating checks are not included.