Terms of Service

Welcome to Period Tools (periodtools.com). By using this website you agree to these Terms of Service. If you don’t agree with any part, please stop using the site.

1. What this site is

Period Tools is a free reference website offering calculators and informational content related to cycle health, lifestyle, and general planning. It is not a medical service. The calculators provide estimates and educational information only.

2. Not medical advice

Nothing on Period Tools is medical advice, diagnosis, or treatment. The calculators are planning aids based on published formulas and conventions. For questions about your health, fertility, or medications, always consult a qualified healthcare provider.

3. Accuracy and warranty

We make a good-faith effort to keep formulas, content, and references accurate. Even so, Period Tools is provided “as is” with no warranty of any kind, express or implied. We do not guarantee results from any calculator or recommendation, and we are not liable for decisions you make based on this site.

4. Acceptable use

You agree not to:

• Use the site for unlawful purposes
• Attempt to circumvent access controls or security measures
• Scrape the content in bulk for republishing without our written permission (a single citation with attribution is welcome)
• Misrepresent Period Tools or its outputs in any context

5. Intellectual property

All site content — text, layouts, design, code, and original images — is owned by Period Tools or its licensors and protected by copyright. Calculator formulas themselves are based on public-domain medical or mathematical conventions. You may cite short excerpts with a clear link back to the source page.

6. Affiliate links and ads

Period Tools does not currently use affiliate links. If we add them in the future, we will disclose it clearly, and any such link would only ever earn us a small commission at no extra cost to you. We may display ads served by Google AdSense and other partners; ad content is the responsibility of the advertisers, not Period Tools.

7. Privacy

Our handling of any data is described in the Privacy Policy. Calculators run in your browser; your inputs are not sent to our servers.

8. Changes to these terms

We may update these Terms from time to time. When we do, we’ll bump the “Last updated” date at the top. Continued use of the site after a change means you accept the new Terms.

9. Contact

For any question about these Terms, email [email protected].