Terms of Service

Last updated: May 2026

Welcome to ZZZCalc. By using this website, you agree to these Terms of Service. Please read them carefully.

1. Use of the Service

ZZZCalc provides a free sleep calculator tool for general informational and planning purposes. You may use this service for personal, non-commercial purposes. You agree not to misuse the service or attempt to access it in any unauthorised way.

2. No Medical Advice

The content and calculations provided by ZZZCalc are for general sleep planning purposes only and do not constitute medical advice, diagnosis, or treatment. Sleep needs vary by individual. If you have persistent sleep problems or a sleep disorder, please consult a qualified healthcare professional.

3. Accuracy of Information

We make reasonable efforts to ensure the accuracy of the sleep cycle calculations and content on this site. However, we make no warranties or representations about the completeness, accuracy, or suitability of the information for any particular purpose. The 90-minute sleep cycle model and 14-minute sleep latency used are average estimates — individual results will vary.

4. Affiliate Links

ZZZCalc participates in affiliate programmes including the Amazon Associates Programme. Some product links on this site are affiliate links, meaning we may earn a small commission if you make a purchase through them, at no extra cost to you. See our Affiliate Disclosure for full details.

5. Third-Party Links

This site contains links to external websites including Amazon. We are not responsible for the content, privacy practices, or availability of those third-party sites. Links to external sites do not constitute endorsement of their content.

6. Intellectual Property

All content on ZZZCalc — including text, design, and code — is the property of ZZZCalc and may not be reproduced, distributed, or used without permission.

7. Limitation of Liability

To the fullest extent permitted by law, ZZZCalc shall not be liable for any direct, indirect, incidental, or consequential damages arising from your use of this website or reliance on any information provided here.

8. Changes to These Terms

We may update these Terms of Service from time to time. Continued use of the site after changes are posted constitutes your acceptance of the updated terms.

9. Contact

If you have any questions about these Terms, please contact us.