Terms of Service

Last updated: July 2026

By using Jet Lag Calculator (the "Service"), you agree to these terms. If you do not agree, please do not use the Service.

Educational purpose only — not medical advice

The Service provides general, educational information about circadian rhythms and jet-lag mitigation based on a simplified model. It is not medical advice and is not a substitute for consultation with a qualified healthcare professional. Using the Service does not create a doctor–patient or any other professional relationship.

Always consult a clinician before taking melatonin or any supplement, changing medication timing, or altering your sleep, especially if you are pregnant, have a medical condition, or take prescription medication. Do not use light-exposure or wakefulness strategies in situations that require alertness (such as driving) when you may be impaired.

No warranty

The Service is provided "as is" and "as available", without warranties of any kind, express or implied, including accuracy, fitness for a particular purpose, or that recommendations will produce any particular result. Circadian responses vary between individuals.

Limitation of liability

To the fullest extent permitted by law, we will not be liable for any direct, indirect, incidental, or consequential damages arising from your use of, or inability to use, the Service or reliance on its output.

Intellectual property

The Service's design, text, and code are owned by their respective authors. You may use the Service for personal, non-commercial purposes.

Third-party links and services

The Service relies on third-party infrastructure (such as hosting and font providers) and may link to external resources. We are not responsible for the content or practices of third parties.

Changes

We may modify these terms at any time; continued use after changes constitutes acceptance. The "last updated" date above reflects the current version.

Contact

Questions about these terms can be sent to hello@jetlagcalculator.net.