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.
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.
Yes. Jet Lag Recovery Calculator is completely free, with no sign-up and no usage limits.
Yes. Jet Lag Recovery Calculator runs in any modern web browser. There is nothing to download or install.
Yes. Jet Lag Recovery Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.