Jet Lag Calculator
Calculate timezone differences and estimate jet lag recovery time for your next flight.
Timezone:
Timezone:
Jet Lag Severity
Time Difference
Recovery Days
Direction
Tips to Minimize Jet Lag
Adjust your schedule before departure. Start shifting your sleep and meal times 2-3 days before your flight. Stay hydrated. Drink plenty of water during the flight and avoid excessive alcohol or caffeine. Get sunlight exposure. Natural light helps reset your circadian rhythm at your destination. Eastward travel is harder. Your body finds it easier to stay up late than to sleep early. Give yourself extra adjustment time. Consider melatonin. A low dose (0.5-3 mg) taken at your destination bedtime can help reset your sleep cycle. Avoid napping on arrival. Stay awake until local bedtime to sync with the new timezone faster.
Frequently Asked Questions
Why is eastbound jet lag worse than westbound?
Your circadian rhythm naturally runs slightly longer than 24 hours, making it easier to stay awake later (delaying your clock, as in westbound travel) than to fall asleep earlier (advancing your clock, as in eastbound travel). Studies show eastbound recovery takes about 50% longer than westbound.
What timezone data does the calculator use?
We use the IANA timezone database (tzdata), the same standard used by operating systems and airlines worldwide. Each airport is mapped to its official timezone, and UTC offsets are calculated for the current date, automatically accounting for daylight saving time transitions.
Can I reduce jet lag by adjusting my schedule before travel?
Yes. Gradually shifting your sleep schedule by 1-2 hours per day in the direction of your destination's timezone before departure can significantly reduce jet lag symptoms. Light exposure timing is the most powerful tool for resetting your circadian clock.
Does jet lag affect everyone equally?
No. Age, individual chronotype (morning person vs night owl), travel frequency, and overall health all influence jet lag severity. Younger travelers and frequent flyers tend to adapt faster. The estimates provided are averages for a typical adult.
At what timezone difference does jet lag become noticeable?
Most people begin to notice jet lag symptoms at a difference of 3 or more hours. Differences of 1-2 hours rarely cause significant disruption. Crossing 6+ timezones typically results in moderate to severe jet lag lasting several days.
Methodology
Jet lag severity is based on the absolute timezone difference between the departure and arrival airports, using the IANA timezone database for accurate UTC offsets including daylight saving time. Recovery time is estimated at approximately one day per hour of timezone difference for eastbound travel and roughly two-thirds of a day per hour for westbound travel. Eastbound jet lag is generally more severe because advancing the body clock (going to sleep earlier) is harder than delaying it.