Disclaimer

Last updated: September 2026. Please read this page carefully before using our calculators.

Educational information only

All content on JetLagCalc — calculators, articles, tables, and examples — is published for general educational purposes. It is not athletic or travel advice and is not a substitute for a qualified professional. We are not qualified coach, trainer, or travel professionals, and no client or advisory relationship is created by your use of this Site.

Our calculators apply standard circadian guidance — roughly one recovery day per time zone, phase-shift rates, light-timing conventions from travel medicine literature. Individual chronotypes shift every schedule.

Frequent travelers and shift workers with persistent sleep problems should see a sleep specialist — the tools here are trip-planning aids, not clinical protocols.

Accuracy of calculations

We implement well-known, publicly documented formulas (see the methodology section on each calculator page and published coaching and industry standards as applicable). Even correctly implemented formulas produce estimates that depend on your inputs and assumptions. Real-world outcomes vary. Do not rely on a single web tool for a consequential decision.

Advertising disclosure

JetLagCalc is funded by display advertising served through Google AdSense. Advertisers have no influence over our content, formulas, or editorial choices, and placement of an ad is not an endorsement.

Errors and corrections

If you spot an error, please email hello@www.jetlagcalc.com with the inputs you used. Verified corrections are published promptly.