Poisson's Ratio Calculator

This Poisson's ratio calculator can assist you in determining any material's Poisson's ratio. This calculator can calculate lateral and axial strain proportions or the relationship between Young's modulus and shear modulus in two methods.

Transverse strain (ε(trans))
Axial strain (ε(axial))
Shear modulus (G)
Modulus of elasticity (E)

Poisson's ratio is defined as the ratio between lateral strain and axial strain of a deformed object. Imagine it like this: if you compress a piece of rubber from above, it will "flow" sideways, increasing its width. On the other hand, if you do the same with cork, you will discover that it merely changes its volume, with almost no increase in width is observed. Rubber is an example of a material with high Poisson's ratio, while cork has a low Poisson's ratio.

How do you find out Poisson's Ratio?

The Poisson's Ratio calculator calculates the Poisson's ratio using the formula; Poisson's ratio = Lateral Strain/Longitudinal Strain. The symbol represents by Poisson's ratio is 𝛎.

There are two types of strain namely lateral and axial.

The Poisson's ratio is the proportion of a deformed object's lateral and axial strains. Imagine compressing a piece of rubber from above, causing it to "flow" sideways, increasing its breadth. When you perform the same thing with cork, though, you'll notice that it only increases its volume, with absolutely no growth in breadth. It means, Rubber has a high Poisson's ratio, but cork has a low Poisson's ratio.

The following formula is used by Poisson's ratio calculator:

v = -ε(trans)/ε(axial)


v = Poisson's ratio 

ε(trans) = transverse (lateral) strain 

ε(axial) = axial strain 

Tension (stretching) is always assumed to be positive, while compression is assumed to be negative. It's worth noting that Poisson's ratio is always positive; it's impossible to have a material that compresses in one direction and then compresses in the other. The Poisson's ratio of most materials ranges from 0 to 0.5, with 0.5 corresponding to a perfectly incompressible material (one that will not change its volume).

Shear Modulus and Young's Modulus

You may also use our Poisson's ratio calculator to calculate Poisson's ratio based on shear modulus and elasticity modulus values. According to the equation below, these three parameters are related:

E = 2G(1 + v)


v = Poisson's ratio;

E = modulus of elasticity 

G = shear modulus 

How can I use this online calculator to determine Poisson's Ratio? 

Enter Lateral Strain (Sd) and Longitudinal Strain (S.L) into this online Poisson's Ratio calculator. Press the calculate button. Finally got the outcome.

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FAQs on Poissons Ratio Calculator

1. What is the significance of the Poissons ratio?

Poisson's ratio is a useful metric for determining how much a material deforms when subjected to stress (stretching or compression). It is crucial in mechanical engineering because it allows for the selection of materials that best suit the desired function.

2. How do you calculate Poisson’s Ratio?

  • Step 1: Measure the object's transverse strain.
  • The strain in the transverse direction will be this.
  • Step 2: Calculate the object's axial strain.
  • The strain in the axial direction will be this.
  • Step 3: Work out the Poisson's ratio.
  • To compute the Poisson's ratio, enter the strain in both directions into the formula.

3. Why Cork's Poisson's ratio is zero?

Cork is an appropriate material for a bottle stopper because of its near-zero Poisson ratio. This is due to the fact that when compressed on both sides, the cork almost never expands. When axial compression is applied to a rubber stopper, however, it expands laterally.

4. What does a 0.3 Poisson ratio imply?

Poisson's ratio will usually be about 0.3 for steel. This means that for every inch of deformation in the direction of stress application, there will be 0.3 inches of deformation perpendicular to the direction of the force application.

5. What causes Poisson's ratio to be negative?

Negative-Poisson's-ratio materials are called dilational (10) because they are easy to change the volume but difficult to shear.