Why is traveling east harder than traveling west?
Traveling east requires shortening your day, which is more difficult than lengthening it.
Travel
Jet Lag Recovery Calculator
Calculate how many days you'll likely need to adjust to the local time after a long flight.
Plan Your Post-Flight Recovery
Estimate jet lag effects based on direction, time zones crossed, and personal sleep schedule.
What this calculator does
Jet lag, or desynchronosis, is a temporary sleep disorder caused by rapid travel across multiple time zones, disrupting your body circadian rhythm. Your body internal clock, which regulates sleep-wake cycles and numerous physiological processes, becomes misaligned with your destination local time. This causes symptoms including fatigue, insomnia, difficulty concentrating, mood changes, and digestive issues. The severity and duration depend on the number of time zones crossed and travel direction. Traveling east typically causes more difficulty than traveling west because it requires shortening your day rather than extending it.
How it works
This calculator determines your optimal jet lag recovery strategy based on your travel details. Input your departure location, destination, and travel direction. The calculator computes the time zone difference and estimates recovery duration. It then generates a personalized timeline with specific recommendations for light exposure, meal timing, sleep scheduling, and activity planning.
Formula
Recovery time = Time zones crossed times adjustment factor. The factor is approximately 1 day per hour westbound, 1.5 days per hour eastbound.
Tips for using this calculator
- Start adjusting your sleep schedule 2-3 days before departure
- Use bright light exposure strategically
- Stay hydrated and avoid alcohol and caffeine
- Consider taking melatonin before target bedtime
- Exercise at the right time of day
Frequently asked questions
How long does jet lag typically last?
Recovery takes approximately one day per hour of time zone difference for westbound travel.