Shaft Calculator v1

Price: £25.41 (£25.41 Inc. VAT)
Shaft performance calculator


The most common method for transmitting power from one place to another is via a rotating shaft, and apart from a properly designed lubrication system and correct bearing selection (see Bearings (low friction) and Bearings (plain)) the difference between a good shaft and a bad shaft is surprisingly little. It is therefore very important to understand what makes this difference and how to accurately define its most important characteristics.

For example; responsiveness and performance can be severely reduced if it is over-designed, and vibrations are responsible for power loss, excessive wear, noise, and early failure from fatigue all of which can be eliminated by ensuring that your shaft runs at the correct speed(s).


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Shafts calculates the performance characteristics of a rotating shaft identifying critical speed, natural frequency, amplification factor and stresses for four different end configurations.

The shafts calculator is a quick and simple calculation facility that may be used alone or in conjunction with our other related calculators; (Beams, Fatigue, Metals, Combined Stress, Bearings, Journals, Stress Concentration, Limits and Fits, Shock Loads, etc.) and its technical help should provide all the help you need to get the most out of it.

For help using this calculator see Technical Help

Shaft Calculator - Options

Shafts includes the following calculation options: Cantilever, Simple-Simple, Simple-Fixed and fixed-Fixed all of which have the same input data as listed below.

You enter: and the shafts calculator will provide:
  • Rotational speed
  • Input torque
  • Eccentric load
  • Eccentricity
  • Distance to 'W'
  • Outside diameter
  • Inside diameter
  • Shaft length
  • Young's modulus
  • Material density
  • Gravitational acceleration
  • Natural frequency
  • Frequency ratio
  • Critical speed
  • Radial force
  • Static deflection
  • Dynamic amplitude
  • Bending moment
  • Shear stress
  • Bending stress
  • Principal stress
  • Shaft spring constant
  • Amplification factor

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