Poisson's Ratio Calculator

Find Poisson's ratio from lateral and axial strain.

Poisson's ratio 0.3

Formula: ν = −lateral strain ÷ axial strain

Step-by-step with your numbers:

1. Values used:

2. Lateral strain = -0.0009

3. Axial strain = 0.003

5. Poisson's ratio = 0.3

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Poisson's ratio describes how a material thins sideways as it stretches.

The math behind it

ν = −lateral strain ÷ axial strain. Most materials fall between 0 and 0.5.

−0.0009 lateral over 0.003 axial → ν = 0.3.

Can it be negative?

Yes — exotic auxetic materials get fatter when stretched.