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Updated 2026-03-07 UTC
Bonferroni Correction Calculator — Adjusted α and p-values — GetCalcMaster
Apply the Bonferroni correction: α' = α/m and adjusted p = min(1, p·m). Includes examples and guidance on when Bonferroni is appropriate.
Bonferroni is the simplest (and often most conservative) multiple-comparisons correction. It controls the family-wise error rate (FWER) by shrinking α or inflating p-values.
Important: Educational. For large-scale testing, consider FDR approaches (BH) instead of strict Bonferroni.
What this calculator is
The Statistics Calculator is an interactive tool inside GetCalcMaster. It’s designed to help you explore scenarios, understand formulas, and document assumptions.
Key features
- Adjust α (per-test threshold) or adjust p-values
- Extremely simple to compute and explain
- Conservative—reduces power when m is large
Formula
α' = α / m
p_adj = min(1, p * m)Quick examples
m=10, α=0.05 → α'=0.005.p=0.01, m=10 → p_adj=min(1,0.1)=0.1.
How to use it (quick steps)
- Count m = number of tests you consider a family.
- Choose a family-wise α (commonly 0.05).
- Compute α' = α/m (per-test threshold).
- Optionally adjust p-values: p_adj = min(1, p·m).
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FAQ
Is this calculator official?
No. GetCalcMaster provides educational estimates and learning tools. Always verify against official definitions, documents, or professional advice.
Do you store my inputs on the server?
No. Calculations run locally in your browser. Optional remember/restore features (if enabled) use local browser storage.
Tip: For reproducible work, save your inputs and reasoning in Notebook.