Poisson's Ratio Calculator

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Choose how you want to compute Poisson's ratio. All three methods give the same result for a linear-elastic isotropic material.
The fractional change in a dimension perpendicular to the applied load. Typically negative when the axial strain is positive (material contracts laterally under tension).
The fractional change in length along the direction of the applied load. Enter as a dimensionless ratio (e.g. 0.001 for 0.1 % elongation). Can't be zero.
Poisson's ratio (nu)Typical metal
0.3

Dimensionless ratio of lateral to axial strain (negative of)

Material classTypical engineering metal (steel, aluminium, titanium)
0.3
Auxetic<0Low0-0.25Typical metal0.25-0.35High0.35-0.45Near-incompressible0.45+

Poisson's ratio = 0.3000

  • A Poisson's ratio of 0.3000 means the material contracts laterally by 0.3000 units for every 1 unit of axial elongation under tension.
  • Typical engineering metal (steel, aluminium, titanium)

Next stepPair this result with Young's modulus to compute the shear and bulk moduli using the moduli method above.

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