Jet Lag
Calculator
Results
- Adjustment days
- 5.333333
- Adjustment hours
- 128
Travel results
| Adjustment days | 5.333333 |
| Adjustment hours | 128 |
formula-map diagram
- Adjustment days
- 5.333333
- Adjustment hours
- 128
Travel relationship
Formula
days = zones × (2 ÷ 3)= 5.3333333333333
Note
This result is a simplified model: it uses the displayed formula and the values you entered, ignoring traffic, weather, winds, stops, terrain, fees and individual variation. Confirm schedules, rates and allowances with the carrier or operator.
More in Travel and navigation
See all →Frequently asked questions
How is expected jet lag severity estimated?+
The calculator generally uses the number of time zones crossed and the direction of travel (eastward or westward) to estimate how many days it may take your body clock to adjust.
Why is eastward travel harder than westward travel?+
The human circadian rhythm naturally runs slightly longer than 24 hours, making it easier to stay up later (as westward travel requires) than to fall asleep earlier (as eastward travel requires).
Does crossing fewer time zones always mean less jet lag?+
Generally yes, since the body adjusts by roughly one time zone per day; but direction, sleep quality on the journey, and individual sensitivity also affect how quickly you recover.
Does a north-south flight cause jet lag?+
Little to none, because jet lag results from a mismatch between your internal clock and local time, not simply from distance traveled; flights that stay within the same or similar time zones cause minimal jet lag regardless of duration.
How can I use the estimated adjustment period?+
Use it to plan your schedule around arrival: avoid important meetings or decisions during the estimated adjustment window, and consider gradually shifting your sleep schedule before departure to shorten it.