Alpha, power, effect, and variance based sizing.
Last Updated: 01 Jan 2026
Required sample size ≈ 63 per arm
Clinical Trial Sample Size Calculator helps you alpha, power, effect, and variance based sizing. It is commonly used by domain specialists, operations teams, learners for clinical trial sample size calculator, pharma sample size, Clinical Research.
Clinical Trial Sample Size Calculator
Alpha, power, effect, and variance based sizing.
- Runs entirely in your browser.
- For planning and education; verify critical decisions with qualified professionals.
Disclaimer: Specialty calculators provide rough estimates for planning and education, not professional engineering, tax, or legal advice.