Poisson's Ratio Calculator
ν from measured axial and lateral strains, with the volume-change insight.
Steel 0.3, aluminium 0.33, concrete 0.2, cork ≈ 0 (why it corks bottles), rubber → 0.5 (incompressible). At ν = 0.5 the volume-change term vanishes — rubber squeezed is rubber displaced.
Formula
Poisson's Ratio Calculator is a free poissons ratio for design engineers, metallurgists and QA inspectors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Poisson's Ratio Calculator
ν from measured axial and lateral strains, with the volume-change insight. The calculation implements ν = −ε_lateral/ε_axial; ΔV/V = ε(1−2ν) (Elasticity theory — Timoshenko). Steel 0.3, aluminium 0.33, concrete 0.2, cork ≈ 0 (why it corks bottles), rubber → 0.5 (incompressible). At ν = 0.5 the volume-change term vanishes — rubber squeezed is rubber displaced.
How to use Poisson's Ratio Calculator
- 1Enter Axial strain in µε.
- 2Enter Lateral strain (contraction +) in µε.
- 3Read Poisson's ratio ν, Volume strain per unit axial instantly — no submit button needed.
Why use Poisson's Ratio Calculator?
- ✓Implements the standard formula — ν = −ε_lateral/ε_axial; ΔV/V = ε(1−2ν)
- ✓Reference cited on-page: Elasticity theory — Timoshenko
- ✓Live worked example: the substitution recomputes from your numbers
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Poisson's Ratio Calculator use?+
It computes ν = −ε_lateral/ε_axial; ΔV/V = ε(1−2ν), per Elasticity theory — Timoshenko. The formula is displayed under the result along with a worked example substituted with your own inputs.
What should I keep in mind when using this calculator?+
Steel 0.3, aluminium 0.33, concrete 0.2, cork ≈ 0 (why it corks bottles), rubber → 0.5 (incompressible). At ν = 0.5 the volume-change term vanishes — rubber squeezed is rubber displaced.
Where do the material property defaults come from?+
Defaults are standard handbook values (ASM, manufacturer datasheets, the cited standard). Always substitute certified values from your material's test certificate for critical work.
Is the Poisson's Ratio Calculator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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