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health.circadian-rhythm-jetlag Calculator
Estimates jet lag recovery time from time zones crossed and travel direction, and recommends a light exposure and melatonin schedule. Eastward crossing is typically 50% harder than westward — the circadian rhythm has a natural >24h period that makes delay easier than advance.
Inputs
Time Zones Crossed
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Direction
Reference formula or conversion factor shown for context.
Age
Age in completed years. Many health and fitness formulas adjust for age.
Results
estimated recovery time (days)
The computed duration or time value.
time zones crossed
The computed duration or time value.
direction
The computed direction or bearing, typically in degrees from north or as a cardinal direction.
east rule
Reference formula or conversion factor shown for context.
west rule
Reference formula or conversion factor shown for context.
tips
Gratuity amount — the suggested amount to add to the bill as a service tip.