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Sample size for Survival analysis (logrank test)

Input
Type I error - Alpha:  
Type II error - Beta: 
Survival rate Group 1: 
Survival rate Group 2: 
Ratio of sample sizes in Group 1 / Group 2: 
Result
Number of cases required in group 1:
Number of cases required in group 2:
Total sample size (2 groups together):

For details, see the MedCalc manual: Sample size: Survival analysis (logrank test).

How to cite this page

  • MedCalc Software Ltd. Sample size for Survival analysis (logrank test). https://www.medcalc.org/calc/sample-size-survival-analysis.php (Version 23.2.1; accessed March 26, 2025)
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© 2025 MedCalc Software Ltd