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Cohen's d Standardised Effect Size Calculator

d = (μ1−μ2)/σ_pooled — Cohen's d effect size.

Calculates Cohen's d standardised effect size between two groups from their means and pooled standard deviation.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

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Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

d = (μ1 − μ2) / σ_pooled; σ_p = √((s1²+s2²)/2)

In depth

Calculates Cohen's d standardised effect size between two groups from their means and pooled standard deviation.