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Health

Timezone & Jet Lag Calculator

Estimate jet lag severity and recovery time for long-distance travel.

How It Works

Jet lag occurs when your body's internal clock (circadian rhythm) is out of sync with the destination's local time. The severity depends primarily on the number of time zones crossed, not flight duration. Flying east typically causes worse jet lag than flying west.

Recovery Guidelines

General rule: allow one day of recovery for each time zone crossed, though this varies by individual. Some travelers adjust faster going west (gaining hours) than east (losing hours), as it's easier to extend your day than cut it short.

💡 TipStart adjusting your sleep schedule 2-3 days before departure. Shift by 1-2 hours per day in the direction of your destination.