Shaft Torque & Stress Calculator

Use circular-shaft torsion relations to estimate peak shear stress and elastic twist from torque, shaft geometry, length, and shear modulus. Suitable for first-pass mechanical checks; keyways, stress concentrations, fatigue, and combined loading are not modeled.

Free · No limits · Runs in your browser

How to use

  1. 1Choose solid or hollow circular shaft.
  2. 2Enter torque, outer diameter, and inner diameter if needed.
  3. 3Enter shaft length and shear modulus to estimate elastic twist.
  4. 4Review peak shear stress, polar moment, and angle of twist.

Frequently asked questions

Does this include keyway effects?
No. Apply stress concentration and fatigue methods separately.
Can I use this for non-circular shafts?
No. The formulas here are for circular torsion only.

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