Our Mission
To provide free, accessible, and scientifically accurate tools that help travelers minimize jet lag and enjoy their trips to the fullest.
We believe that understanding your body's circadian rhythm shouldn't require a degree in chronobiology. Our calculator translates decades of peer-reviewed research into personalized, actionable plans that anyone can follow.
What We Do
Our jet lag calculator is built on established circadian rhythm research from leading sleep scientists and chronobiologists. We use proven formulas based on:
- Body Temperature Minimum (MinT) calculations
- Phase Response Curve (PRC) research
- Light exposure timing studies
- Melatonin effectiveness research
- Pre-flight adaptation protocols
Every recommendation is backed by peer-reviewed studies. See our Science page for detailed research citations.
Jet lag affects millions of travelers every year, yet most people rely on generic advice or expensive apps. We believe this information should be free and accessible to everyone.
Our calculator is completely free to use, with no sign-ups, no subscriptions, and no hidden costs. All calculations happen in your browser—we don't even store your travel information.
Unlike generic "get morning sunlight" advice, our calculator creates personalized plans based on:
- Your specific origin and destination cities
- Your exact departure and arrival times
- Your personal sleep schedule (bedtime and wake time)
- The direction and magnitude of time zone change
This personalization makes our recommendations more effective than one-size-fits-all approaches.
Our Values
We only recommend methods backed by scientific research. If there's no evidence, we don't include it—even if it's popular advice.
We prioritize user safety with prominent medical disclaimers and clear warnings about melatonin use, especially for those with health conditions.
We explain how our calculator works, cite our sources, and acknowledge limitations. No black boxes or mysterious algorithms.
Your travel data stays in your browser. We don't track your trips, require accounts, or sell your information. See our Privacy Policy for details.
How It Started
Jet Lag Calculator was created by travelers who were frustrated with generic jet lag advice that didn't account for individual differences or travel specifics.
After discovering the research on circadian rhythm science and light exposure timing, we realized that effective jet lag prevention requires personalized calculations—not one-size-fits-all tips.
We built this tool to make that science accessible to everyone, whether you're a frequent business traveler, planning a vacation, or visiting family across time zones.
What Makes Us Different
Personalized Calculations
Based on YOUR sleep schedule and travel details, not generic advice
Research-Backed
Every recommendation cites peer-reviewed studies—see our Science page
Completely Free
No sign-ups, no subscriptions, no hidden costs—just free tools
Privacy-Focused
All calculations happen in your browser—we don't store your data
Jet Lag Calculator provides educational information based on circadian rhythm research. This information is not medical advice and should not replace consultation with a healthcare provider. Always consult your doctor before making changes to your sleep schedule or taking supplements like melatonin, especially if you have medical conditions or take medications.