Sample size calculator for clinical research including: one- and two- sample parallel designs. All 4 primary comparisons are covered : equality, equivalence, non-inferiority and superiority. It is suitable for calculating sample size for comparison of means and proportions. Simplified power calculations was also included in this version.
It is a handy calculator for consultants or researchers. The interface was made to be simple and easy to use. It is intended to get an initial estimate of a sample size and can be used before consulting an expert.
Check out for new versions when other designs will be added.