Shaft sizing calculator
Enter torque (+bending) → minimum shaft diameter and twist angle.
How to use
- Enter the calculation conditions
Enter the dimensions, loads, speeds or operating conditions requested by the form.
- Run the calculation
The tool applies the formulas shown on this page to the entered values.
- Review the result
Review the resulting specification and checks, then verify them against the cited source, current standard and real operating conditions before use.
Core formula
T_eq = √((Km · M)² + (Kt · T)²)
Example using default values
T_eq = √((1.5 · 0)² + (1 · 50)²) = 50 N·m
Source: Shigley Mechanical Engineering Design / ASME B106 shaft design.
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