Effect Size Calculator (Cohen's d)

Measure the standardized difference between two group means.

CALCULATE

Formulas

d = (M1 - M2) / SD_pooled

Small: 0.2, Medium: 0.5, Large: 0.8 (Cohen's benchmarks)

Cohen's d

Standardized effect size independent of sample size. Tells you HOW DIFFERENT two groups are, not just whether the difference is statistically significant. Essential for meta-analyses and power calculations.

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