Gear Contact Stress Calculator (Hertzian)

Simplified Hertzian contact-stress screen for spur gear meshing.

Tangential load Wt (N)Face width F (mm)Pinion pitch diameter d (mm)Elastic coefficient Cp (√MPa, ~191 steel-steel)Geometry factor ICalculate

Equation

σc = Cp × √(Wt / (F × d × I))

Assumptions

Simplified screening form — full AGMA contact stress includes additional load, size, geometry and hardness-ratio factors not modelled here.