Legal
Terms of Use
Last updated: August 25, 2026
1. The service
Sleep Time Calculator provides free, browser-based sleep tools — including bedtime and wake-up calculators aligned to 90-minute sleep cycles, a nap length guide, a sleep debt estimator, and a jet lag recovery planner — together with educational articles about sleep science. All calculations run locally in your browser and no account is required.
2. Not medical advice
The tools and articles on this site are for general informational and educational purposes only. They are based on population-level averages (such as the roughly 90-minute sleep cycle) and cannot account for your individual health, medication, or sleep disorders. Nothing on this site is medical advice, diagnosis, or treatment. If you have persistent sleep problems, excessive daytime sleepiness, or suspect a sleep disorder, consult a qualified healthcare professional.
3. Permitted use
You may use the calculators and read the content for personal, non-commercial purposes. You may not copy or scrape the site at scale, redistribute its content as your own, interfere with site operation, or use the service to violate another person's rights.
4. Intellectual property
The site design, calculator logic, and original articles are the property of calculatorsleeptime.com. You may link to any page freely. Short quotes with clear attribution and a link are welcome; wholesale reproduction is not.
5. Availability and external links
The service is provided free of charge and may change, pause, or remove content at any time. Pages may link to external resources; we do not control and are not responsible for the content or practices of third-party websites.
6. No warranties
The site is provided on an "as available" basis. To the extent permitted by law, we do not promise uninterrupted availability, error-free operation, or that the calculators' estimates will match your individual physiology. Nothing in these terms excludes rights that cannot lawfully be excluded.
7. Limitation of liability
To the extent permitted by law, Sleep Time Calculator will not be liable for indirect, incidental, or consequential loss resulting from use of the site or decisions made based on its estimates. Our total liability for a claim relating to this free service will not exceed the amount you paid us for it, which is zero.
8. Changes and contact
We may update these terms when the site or legal requirements change. Continued use after an update means the revised terms apply from the date shown above. Questions can be sent to [email protected]. See also our Privacy Policy.