Terms, Affiliate & Ad Disclaimer

These terms explain how you may use this site, what we do and do not promise, and how advertising works here. In short: the tools are free to use for learning, the results come with no warranty, and the ads you see do not affect the calculations.

Terms of use

The tools on this site are provided free for educational use. You may use them to learn, to check your working, and to explore statistics. They are for general learning and illustration, not for any purpose where an error could cause harm.

The calculators and guides are provided “as is”, without any warranty. We do not promise that the results are error-free, complete, or suitable for any particular purpose. You use the results at your own risk.

The site and its content are not a substitute for professional statistical advice. For decisions that matter — a grade, a report, a business decision — check with a qualified person and confirm the result from a second source.

Do not use the tools for anything unlawful, and do not try to copy, scrape or overload the site. We may change or remove tools, guides or pages at any time. Links to other sites, such as the NIST/SEMATECH e-Handbook of Statistical Methods, are provided for reference; we are not responsible for their content.