Terms of use

Last updated: September 2026

By using Calculator Tools you agree to these terms. If you do not agree with them, please do not use the site.

Use of the site

The calculators are free to use for personal and commercial purposes. No account is required. You may link to any page freely.

Results are estimates

Every result depends on the values and assumptions you enter. The calculators are provided for information and convenience, not as professional advice. Before acting on a result that carries financial, legal, medical, structural or safety consequences, check it against an authoritative source or a qualified professional. See the disclaimer for more.

No warranty

The site is provided “as is”. We work hard to keep the formulas correct and to document them on each page, but we do not warrant that every result is free of error or fit for a particular purpose, and we are not liable for loss arising from use of the site. If you find an error, please report it so it can be fixed.

Acceptable use

Please do not attempt to disrupt the service, bypass rate limits, scrape the site at a volume that degrades it for others, or republish the content wholesale as your own. Automated requests should be reasonable and identify themselves.

Content and intellectual property

Mathematical formulas and physical constants are facts and belong to nobody. The written explanations, page design, code and presentation on this site are ours. Quoting a short passage with a link back is fine; copying pages is not.

Availability and changes

The site may be updated, changed or taken offline at any time without notice. These terms may also change; the date above shows the current version.

Contact

Questions about these terms can be sent through the contact page.