Statistics calculators that show their work.
Over 150 calculators covering probability, distributions, hypothesis testing, regression, and more — each one built to explain the formula, not just return a number.
Popular calculators
Browse by category
Eleven categories covering the full range of introductory and applied statistics.
Why use sahajTools
Formulas you can verify
Every calculator shows the method behind the result, so you can check the work — not just copy an answer.
Built for every device
Fast, lightweight, and fully usable on a phone during a lecture or an exam review session.
No account required
Every calculator is free and open — no sign-up, no paywall, no unnecessary friction.
Looking for a specific formula?
Search the full calculator library or browse by category to find the exact tool you need.
Browse all calculators