Jet Lag Recovery Calculator
Fill in the values and the answer updates as you type.
How the Jet Lag Recovery Calculator works
A common rule of thumb says the body adjusts about one time zone per day when flying east and about 1.5 time zones per day when flying west. Travelling east is harder because it shortens your day. Sleep, light exposure, and age change real recovery, so treat this as a rough guide. Example: with the default values, crossing 8 zones eastward takes about 8 days.
Inputs and results
The Jet Lag Recovery Calculator takes 2 inputs and gives 2 results.
What you enter
- Time zones crossed (hours) — starts at 8.
- Direction of travel — starts at East. Choose from: East and West.
What you get
- Estimated recovery (days)
- Hours of time shift
Example: Jet Lag Recovery Calculator with the starting values
With time zones crossed 8 hours and direction of travel East, the calculator returns:
| Estimated recovery (days) | 8 |
|---|---|
| Hours of time shift | 8 |
Change any value above and the results update straight away.
Jet Lag Recovery Calculator FAQ
How do I use the Jet Lag Recovery Calculator?
Enter time zones crossed and direction of travel in the fields, then read estimated recovery (days) and hours of time shift in the result panel. The answer updates as you type, and you can press Calculate or Enter to refresh it. Use “Copy link” to share your exact numbers with someone else.
What does the Jet Lag Recovery Calculator calculate?
Estimate how many days your body needs to adjust to a new time zone. It returns estimated recovery (days) and hours of time shift from the 2 values you provide.
What values does the Jet Lag Recovery Calculator start with?
It opens with time zones crossed 8 hours and direction of travel East so you can see a working result straight away. Replace them with your own numbers, or press Reset to return to these starting values.
Is the Jet Lag Recovery Calculator free and private?
Yes. It is free, needs no account, and runs in your browser, so nothing you type is sent to or stored on our servers. See the Privacy Policy for details.
Can I rely on the Jet Lag Recovery Calculator for important decisions?
Treat the result as a well-rounded estimate. Real situations often have details a general calculator cannot know, so confirm important decisions with a qualified professional. See the Disclaimer for more.