Welcome!
This web site offers free resources for students and researchers working with statistics in the social sciences. All the calculators and tools featured here have been designed with ease of use and clarity of presentation in mind. Certainly, you should find them much less cumbersome — and definitely less expensive! — than SPSS and the like.
🧙♂️ Not sure which test to use?
Let our wizard guide you to the right statistical test in 30 seconds.
Statistical Tests
Hypothesis testing, ANOVA, t-tests, and more.
P-Value Calculators
Derive p-values from Z, t, chi-square and Pearson r.
Descriptive Statistics
Averages, variance, standard deviation, and charts.
Power Analysis Suite
Calculate statistical power and required sample sizes for your study design.
Charts
Create histograms, box plots, and other statistical visualizations.
Utilities
Percentile calculators, p-value tools, and other handy utilities.
Why Should You Trust These Tools?
All calculators on this site are rigorously verified against R, the gold-standard statistical software used by researchers worldwide. Our automated test suite runs 79 verification tests across 25+ statistical methods, ensuring accuracy to 4+ decimal places.
View our full verification methodology →