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Jet Lag Calculator

See the time difference for your trip, which way your body clock has to shift and simple tips to adjust faster.

  1. Enter your details
  2. Adjust the options
  3. Copy or download the result
Runs in your browser. Your data and files never leave your device.
Results are general estimates and are not medical advice. Talk to a health professional about your circumstances.

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About the Jet Lag Calculator

Choose where you’re flying from and to, and the date. You’ll see the time difference, how far — and which way — your body clock needs to shift, and practical tips for before and after you fly.

Your body clock adjusts the shorter way round: a 15-hour difference feels like 9 hours the other way. Travelling east (shifting earlier) is usually harder than travelling west.

Frequently asked questions

How long does jet lag last?

It varies from person to person. A common rule of thumb is up to about a day per hour of time difference, and eastward trips usually take longer.

Does daylight saving matter?

Yes — the calculator uses each city’s time on the date you choose, including daylight saving.

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