Jet Lag Recovery Calculator
Crossing several time zones throws off your internal body clock, and a common rule of thumb is that it takes roughly one day per time zone to fully adjust. Enter the number of time zones you crossed and the direction of travel, and this tool estimates how many days your body needs to recover. Eastward trips are usually harder because you lose hours and have to fall asleep earlier than your body wants, so the estimate is a little longer for east than for west. The result gives you a realistic window to plan meetings, races, or sightseeing around, plus direction-specific light and sleep tips. It is an estimate, not medical advice, and everything is calculated locally in your browser with nothing sent anywhere.
How to use Jet Lag Recovery Calculator
- Enter your origin and destination time zones or their difference.
- Note the direction of travel, east or west.
- Read the estimated days to adjust.
- Follow the direction-based tips to speed recovery.
Frequently asked questions
How does it estimate jet lag recovery time?
It bases the estimate on the number of time zones you cross, since the body adjusts its clock roughly one time zone per day.
Why does travel direction change the estimate?
Flying east shortens your day and is usually harder to adjust to than flying west, so the tool factors direction into the recovery tips it gives.
Is the recovery figure exact?
No, adjustment varies by person, sleep and light exposure, so treat the days as a rough guide rather than a precise medical prediction.
What is Jet Lag Recovery Calculator?
Crossing several time zones throws off your internal body clock, and a common rule of thumb is that it takes roughly one day per time zone to fully adjust. Enter the number of time zones you crossed and the direction of travel, and this tool estimates how many days your body needs to recover.
Is Jet Lag Recovery Calculator free to use?
Yes. Jet Lag Recovery Calculator is completely free, with no sign-up and no usage limits.
Does Jet Lag Recovery Calculator work in a web browser?
Yes. Jet Lag Recovery Calculator runs in any modern web browser. There is nothing to download or install.
Is my data private with Jet Lag Recovery Calculator?
Yes. Jet Lag Recovery Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
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