Mechanical Engineering Calculations

AGMA Gear Calculator + Measurement & Reporting

AGMA / ISO Gear Calculator — Geometry, Full AGMA Strength (Bending & Contact)

Now includes full AGMA-style bending and contact stress calculations (K-factors, geometry factors I & J approximations, Cp elastic coefficient, allowable stress checks). All calculations show formulas, intermediate values and give options for user overrides. Notes: I and J geometry factors are calculated using AGMA/Levi approximations; for contract acceptance use AGMA 908-B89 tables or FEM validation.

Geometry & Load Inputs

Gear Type

Units

Pressure Angle α [deg]

Pinion (Gear A)

Teeth N1

Teeth N2

Module (m) or DP

Face width b

Operating Conditions

Torque (T)

Speed (rpm)

Helix angle β [deg]

Service / Application factor Ko

Material & Elastic Properties

Pinion Material (E, ν)E in N/mm² (steel=210000)

Gear Material (E, ν)E in N/mm²

Poisson’s ν (both)

Allowable bending stress σ_all [MPa]

K-Factors & Geometry Overrides

Dynamic factor Kv (auto)

Quality number (Qv) for Kv mapping

Enter Kv manually

Size factor Ks

Load distribution factor Km

Face load factor KH (face load)

Reliability/temperature factor Kf

Allow user override for J (bending geometry)

Results — AGMA Strength

Press ‘Calculate AGMA Strength’ to compute bending stress, contact stress, safety factors and show full calculation steps (formulas, intermediate values, references).