When to use this calculator
Calculate Poisson’s ratio from transverse and longitudinal strain. Both strains should describe the same small elastic load state.
Explore the stress, strain & material response calculators for other questions in this topic. For a related calculation, use the Shear Modulus From Youngs Modulus Calculator: Relate shear modulus to Young’s modulus and Poisson’s ratio.
PUTTING IT INTO PRACTICE
Poissons Ratio: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Longitudinal strain | 0.001 |
| Transverse strain | -0.0003 |
| Result | 0.3 |
- Check the input labels and enter the example values above.
- Apply the relationship: Poisson ratio = −transverse strain/longitudinal strain.
- The result is 0.3 , rounded for display.
How to interpret your result
Both strains should describe the same small elastic load state.
Match the load, section and units before calculating. Nominal stress omits local concentrations, instability and many real failure mechanisms. These educational relationships do not verify a design against a standard.
Frequently asked questions
Does a low nominal stress prove a component is safe?
No. Local stress, fatigue, buckling, connections, defects, environment and applicable design requirements can control the result.
When is the poissons ratio calculator useful?
Calculate Poisson’s ratio from transverse and longitudinal strain. Both strains should describe the same small elastic load state.
How do I use the poissons ratio calculator?
Enter longitudinal strain, transverse strain. The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Poisson ratio = −transverse strain/longitudinal strain.
What should I check before using the result?
Both strains should describe the same small elastic load state.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
Further reading
For background on this topic, see OpenStax: stress, strain and elastic modulus ↗. This is a topic reference, not an external review or endorsement of this tool.
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