Terms of use

Last updated 23 October 2026.

Using the tools

The calculators are provided for general information and educational use. Check your inputs, units, assumptions, and results before relying on an output.

Estimates and professional advice

Outputs may simplify real-world rules or contain errors. They are not a substitute for financial, tax, legal, medical, engineering, or other professional advice. The site does not guarantee that an estimate matches a lender, tax authority, healthcare provider, or other third party’s calculation.

Availability and changes

Tools, formulas, and content may change. Save any results you need. Third-party websites linked from this site have their own terms and privacy practices.

Appropriate use

Do not misuse the site, interfere with its operation, or use outputs to mislead others. Report suspected errors using the guidance on our Contact page.