Jet Lag Recovery Calculator
Estimate how long jet lag will last: count the time zones crossed and get a practical recovery plan for your body clock.
About this tool
Count the time zones between your origin and destination and get a realistic jet lag estimate, with the key difference between easier westbound and tougher eastbound travel.
Jet lag is not muscle fatigue — it is your circadian clock out of sync. Knowing the recovery window helps you plan meetings, work and sightseeing around your sharpest hours instead of fighting them.
FAQ
How long does jet lag last?
Roughly one day per time zone crossed, worse when flying east. This calculator estimates the recovery window.
Why is flying east worse?
You lose hours and must sleep earlier than your body wants — considerably harder than staying up later after a westbound flight.
What actually helps?
Light is the master switch: morning light advances your clock, evening light delays it. Hydrate, skip caffeine before bed, and keep meals on local time.