Terms of service

The Jet Lag Calculator provides general information about sleep and circadian timing. It is not medical advice, it does not diagnose or treat any condition, and it does not replace consultation with a qualified clinician.

Speak to a clinician or pharmacist before taking melatonin or any supplement, before changing prescribed medication, and before following a sleep schedule if you are pregnant or breastfeeding, managing a diagnosed sleep disorder, managing epilepsy, diabetes or a cardiovascular condition, or operating vehicles or machinery professionally.

Never delay seeking medical advice because of something you read on this site. In an emergency, contact your local emergency service.

You may use the calculator for personal and commercial trip planning at no cost and without an account. You may not scrape the site at a rate that degrades it for others, reproduce it as a competing service, or present its output as your own tool.

The calculator applies established circadian timing principles to the details you enter. Individual responses vary with age, chronotype, health and the light a traveller actually meets. A schedule is a plan, not a prediction, and the site makes no guarantee that following it will eliminate jet lag.

Airport records and time zone data are compiled from public sources and the platform time zone database. Both can contain errors and both change over time. Confirm critical flight details with your airline rather than with this site. Report data problems through the contact page.

The site is provided as is and as available. It may be changed, interrupted or withdrawn at any time without notice.

The site design, written content, calculation method and source code are owned by jet-lag-calculator.com. Airport and country records are derived from OurAirports, which releases its data into the public domain, and carry no restriction from us.

To the fullest extent permitted by law, jet-lag-calculator.com is not liable for any indirect, incidental or consequential loss arising from use of the site, including missed connections, missed commitments, lost earnings or health outcomes. Nothing in these terms limits liability that cannot be limited by law.

These terms may be updated. Changes are published on this page with a new effective date, and continuing to use the site after a change means accepting the updated terms.

Questions about these terms go to hello@jet-lag-calculator.com.