ENGINEERING TOOL

Shaft Torque Calculator

Calculate torque from tangential force and lever arm, plus nominal shear stress in a solid circular shaft.

Shaft Torque Calculator

FREE ONLINE TOOL

Torque

100 N·m

Nominal maximum shear stress

18.8628 MPa

Formula and assumptions

T = F × r; τmax = 16T/(πd³)

Pure static torsion in a solid circular shaft. No bending, axial load, keyways, fatigue, stress concentration or allowable material stress. Not a shaft selection or safety factor check.

Technical reference: Mechanics Reference — Torsion

STEP BY STEP

How to use shaft torque calculator

  1. Check the input units and assumptions.
  2. Review the result and example.

IN PRACTICE

Example

1000 N × 100 mm = 100 N·m; solid Ø30 mm: τ ≈ 18.86 MPa.

GOOD TO KNOW

Which model does this calculator use?

Pure static torsion in a solid circular shaft. No bending, axial load, keyways, fatigue, stress concentration or allowable material stress. Not a shaft selection or safety factor check.