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Sample Size Calculators
for designing clinical research
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All calculators on this site
Descriptive statistic
Compare two groups (hypothesis test)
Measurement is binary
Estimate precision given sample size
Proportion - Confidence interval given N
Seroprevalence - CI given N
Likelihood ratio - CI given N
Predictive value - CI given N
AUROC - CI given N
Risk ratio - CI given N
Estimate sample size given precision
Proportion - N given CI
AUROC - N given CI
Estimate detectable effect size
Proportions - Effect size
Estimate sample size
Proportions - Sample size (Standard)
Proportions - Sample size (Alternative)
Compare tests using McNemar's
Measurement is continuous
Estimate precision given sample size
Mean - Confidence interval given N
Estimate sample size given precision
Mean - N given confidence interval
Correlation coefficient - N
Estimate detectable effect size
Means - Effect size
Means - Effect size (Clustered)
Paired t-test - Effect size
Logistic regression - Effect size
Estimate sample size
Means - Sample size
Means - Sample size (Clustered)
Paired t-test - Sample size
Logistic regression - Sample size
Measurement is time-to-event (survival)
Estimate precision
Exponential failure rate - CI given N
Estimate sample size
Exponential failure rate - N given CI
Estimate sample size
Survival Analysis - Sample Size
Other calculators
Prevalence estimation
Posterior Probability of Disease
Pediatric Growth