Calcvers
Jet Lag Calculator
Planning
Generated
September 24, 2026
Estimated recovery
6 days
8 zones crossed eastward
Your inputs
- Time zones crossed
- 8 zones
- Travel direction
- East
Breakdown
- Zones crossed
- 8
- Direction
- East (harder)
First days after arrival
| When | Advice | Status |
|---|---|---|
| Day 1 | Morning light, delay caffeine | Still adjusting |
| Day 2 | Morning light, delay caffeine | Still adjusting |
| Day 3 | Morning light, delay caffeine | Still adjusting |
| Day 4 | Morning light, delay caffeine | Still adjusting |
| Day 5 | Morning light, delay caffeine | Still adjusting |
A rule of thumb: roughly one day of adjustment per one or two time zones, with eastward travel slower.
What this means
Jet lag happens when your internal body clock is out of sync with the local time at your destination. The bigger the time-zone jump, the longer it takes to resync. Eastward travel is generally harder because moving your clock earlier fights your natural tendency to run slightly longer than 24 hours. A common guideline is about one day of recovery per one or two zones, with eastward trips at the slower end — hence the ~0.7 and ~0.5 days-per-zone estimates here.
Recommendations
- Shift your sleep and meal times toward the destination schedule a few days before you fly.
- Get bright morning light on arrival — it's the strongest signal for resetting the body clock.
- Avoid naps longer than 30 minutes during local daytime, and time caffeine early.
Watch out
- Estimates vary widely between people — age, chronotype and prior sleep debt all matter.
- This is guidance, not medical advice; persistent severe symptoms are worth a professional check.