MedCalc's free statistical calculators

Our QuickCalcs section provides free online statistical calculators for medical research. You can perform statistical tests, calculate the required sample size for your study, and evaluate statistical power after data collection.

• Statistical tests — run common tests such as odds ratio and relative risk calculations.
• Sample size calculation — determine how many subjects you need before starting your study.
• Post-hoc power analysis — assess the statistical power of a completed study.