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Online statistical calculators
MedCalc's free online sample size calculations
Sample size for statistical tests
Single mean
Single proportion
Comparison of means
Paired samples t-test
Comparison of proportions
McNemar test (paired proportions)
Odds ratio
Correlation coefficient
Survival analysis (logrank test)
Area under ROC curve
Comparison of two ROC curves
Sample size for Confidence Interval estimation & precision
Single mean
Single proportion
Difference between means
Mean difference between paired samples
Difference between proportions
Difference between paired proportions
Coefficient of Variation from duplicate measurements
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