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Tools

Jet-Lag Calculator

Long-haul tourists routinely under-perform on day one. This tool estimates when you\'ll be sober, alert, and decision-ready — so you don\'t blow the trip in the first 24 hours.

Origin time zone (UTC offset)

Destination time zone (UTC offset)

Flight duration (hours)

Sleep on plane (hours)

Arrival local hour (0–23)

Direction

How this works

Rule-of-thumb adjustment time is roughly one day per time zone for eastbound, two-thirds of a day for westbound. Light exposure (or avoidance) at the right local time is the single biggest accelerator. Avoid alcohol on day one — dehydration compounds jet-lag and impairs judgement during the highest-risk part of an adult-tourism trip.