Sample Size Calculator: Calculate Sample Size For Any Study Design
(Calculate Sample size)

Sample Size Calculator image

Integrated Sample Size Calculator

Instructions:
This tool provides sample size calculations for various study designs. Select the type of study from the dropdown menu below, and the corresponding input fields and formula will appear. Enter the required values, then click "Calculate Sample Size" to see the result on the calculator screen. The advice table below will provide guidance on interpreting the result.
Disclaimer: This tool is for informational purposes only and is not a substitute for professional statistical advice. Sample size calculations depend on accurate parameter estimates. Consult a statistician for complex study designs or if unsure about input values.
Select a study type to see the formula
Sample SizeAdvice

This tool was developed by PublicHealthVoice with reference to the following sources:

  • Lwanga, S. K., & Lemeshow, S. (1991). Sample Size Determination in Health Studies: A Practical Manual. World Health Organization.
  • Fleiss, J. L. (1981). Statistical Methods for Rates and Proportions. Wiley.
  • Schlesselman, J. J. (1982). Case-Control Studies: Design, Conduct, Analysis. Oxford University Press.
  • Woodward, M. (2014). Epidemiology: Study Design and Data Analysis. Chapman and Hall/CRC.
  • Freedman, L. S. (1982). “Tables of the number of patients required in clinical trials using the log-rank test.” Statistics in Medicine, 1(2), 121–129.
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