Terms of Use

Plain-language terms for using the calculators and information on this site.

Last updated: September 29, 2026.

Informational use

Useful Math Tools provides calculators and explanations for general informational purposes. Results are estimates where assumptions, rounding, rates, coverage, or real-world conditions may vary.

Your decisions

You are responsible for checking inputs and deciding how to use a result. Financial, legal, tax, health, engineering, regulatory, and other consequential decisions may require advice from a qualified professional or confirmation from the responsible authority.

No warranty

The site is provided as available without a warranty that every tool is suitable for a particular purpose or that access will always be uninterrupted. We work to make the calculations accurate and clear, but errors can occur.

Responsible use

Do not misuse the site, interfere with its operation, or attempt to access systems or data without authorization.