Wake up between sleep cycles, not in the middle of one. Choose when you want to wake up (or go to bed) to see the best times.
loading toolHow to use the sleep calculator
- Type your numbers in the boxes (pick your currency or units if asked).
- The answer updates as you type: no button to press.
- Copy the result, or share it on WhatsApp with one tap.
Questions
How long is a sleep cycle?
About 90 minutes, though it varies from person to person and through the night.
Is my data private?
Yes. Everything happens inside your own browser: nothing you type or choose is uploaded to us or anyone else.
Is it free?
Completely free, with no sign-up, no watermark and no limit on how many times you use it. Light ads keep the site running.
