Statistics calculators that show you how.
Statoma is a free statistics calculator suite built to explain the method, not just return an answer.
T-test calculator
Compare means and prepare to interpret one-sample, paired, independent, and Welch tests.
P-value calculator
Turn common test statistics into p-values with an explanation of tail direction and distribution choice.
Confidence interval calculator
Estimate uncertainty around means, proportions, and differences with clear interval interpretation.
Sample size calculator
Plan studies by connecting precision, power, and practical sample size decisions.
Chi-square calculator
Check categorical data patterns for goodness of fit and independence questions.