Jet Lag Recovery Calculator
Estimate how many days it takes to shake off jet lag after crossing time zones.
Quick answer: enter your details below and click Estimate Recovery — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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Everyday & Lifestyle
Enter your details below.
How to use
- Enter how many time zones you crossed.
- Choose east or west for the direction of travel.
- Click Estimate Recovery.
- Plan light exposure and sleep around the estimated days.
About this tool
Enter how many time zones you crossed and whether you flew east or west, and the calculator gives a rule-of-thumb recovery estimate: about one day per hour eastbound, when the body clock must move earlier, and about one day per two hours westbound, when the shift is usually easier. It is a rough planning estimate, not medical advice, and sleep, light, and meals all affect real recovery.
Frequently asked questions
Why is eastbound jet lag usually worse?
Flying east forces the body clock earlier, which most people find harder than the later shift of westbound travel.
Is this estimate medical advice?
No. It is a planning rule of thumb; illness, poor sleep, or a heavy schedule can all slow real recovery.