Effect Size Calculator
Convert Cohen's d, r, odds ratio, eta-squared, and Cohen's f with assumptions shown.
Primary equivalent
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Assumptions appear in the table.
| Metric | Value | Formula | Assumption |
|---|
r = d / sqrt(d^2 + 4), OR = exp(d * pi / sqrt(3))
How?
How this is calculated
Equal-group conversions use the standard relationship between Cohen's d and the point-biserial correlation. Odds-ratio conversion uses Chinn's logistic approximation, so the table marks it as an approximation.
Formula: r = d / sqrt(d^2 + 4), OR = exp(d * pi / sqrt(3))
Sources
- Effect size overview. Wikipedia. Retrieved .
- Chinn odds-ratio approximation. Statistics in Medicine. Retrieved .
Method last reviewed