Jet Lag Calculator

  • What time do you go to bed?

  • What time do you wake up?

  • What city are you flying from?

  • What city are you flying to?

  • What date are you departing?

Our jet lag calculator will tell you when to receive light to reduce jet lag. Sleep scientists Professor Leon Lack & Dr Helen Wright developed this algorithm, which considers your departure and arrival cities, as well as your current sleep pattern.

Controlling your exposure to light will reduce jet lag. This natural method of jet lag reduction is well established in the scientific literature.

Now the world’s highest selling wearable light therapy device, Re-Timer is available from this website. Use light to naturally adjust your body clock to your new time zone before you depart, just 30 minutes a day.

The calculator is available below and also as a free iPhone App.


Beat Jet Lag on your next trip

Make sure you’re awake and alert on arrival at your destination.

Get the most out of your trip.