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Calcimator

Jet Lag Calculator

Estimate jet lag severity and recovery time based on timezone changes, travel direction, and flight duration.

Inputs

hrs
hrs
hours

Results

Jet Lag Severity

Significant

Timezone Difference6 hours
Estimated Recovery9 days
Arrival Local Time8:00
Your Body Clock Time2:00
Sleep StrategyTry to sleep earlier a few days before departure
Light Exposure TipSeek morning light at destination, avoid evening light

Jet Lag Severity

Significant

How to Use This Calculator
  1. Start by filling in the input fields below. Results update instantly as you type, so you can experiment with different values to see how they affect the outcome.
  2. Departure Timezone (UTC offset) — e.g., -5 for EST, 0 for GMT Accepts values from -12 hrs to 14 hrs (default: -5 hrs).
  3. Arrival Timezone (UTC offset) — e.g., 1 for CET, 9 for JST Accepts values from -12 hrs to 14 hrs (default: 1 hrs).
  4. Travel Direction — Direction of travel (east or west). Choose from: Eastward, Westward. default: 0.
  5. Departure Time (24h) — enter a numeric value. Accepts values from 0 to 23 (default: 18).
  6. Flight Duration — enter a number in hours. Accepts values from 1 hours to 24 hours (default: 8 hours).
  7. Once all inputs are set, review your results in the Results panel. Here's what each output means:
  8. Jet Lag Severity — your calculated result. This is the primary result of this calculator.
  9. Timezone Difference — shown as a numeric value.
  10. Estimated Recovery — shown as a numeric value.
  11. Arrival Local Time — your calculated result.
  12. Your Body Clock Time — your calculated result.
  13. Sleep Strategy — your calculated result.
  14. Light Exposure Tip — your calculated result.
  15. View the Recovery Progress below for a visual breakdown of how the numbers relate to each other.
  16. Explore the related calculators below if you need deeper analysis or want to approach this topic from a different angle.
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