Sample Size Calculators
Use these free online calculators to estimate the needed sample size for a straightforward one- or two-group study. The methods referenced in these links rely on specific assumptions and data specifications. To ensure the application is appropriate, we encourage you to consider collaborating with a quantitative expert. For materials on finding and building collaborations with biostatisticians please see the Finding and Working with a Biostatistician topic.
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Use these calculators for studies examining means or proportions, studies with clustered data, survival analysis, and more.Statistical calculators…
Use these calculators for clinical trials including superiority, equivalence and non-inferiority trials.Calculators for clinical trialsWhat the…
Use these calculators for studies with quantitative, qualitative or survival outcomes.Statistical tools: calculatorsWhat the calculators offerThis…