Sleep Calculator

The page shows several practical options and highlights the durations closest to healthy, adequate sleep.

What do you want to calculate?
  • 02:153 cycles - 4.5 hours of sleep
  • 00:454 cycles - 6 hours of sleep
  • 23:155 cycles - 7.5 hours of sleepRecommended
  • 21:456 cycles - 9 hours of sleepRecommended

Why do sleep cycles matter?

Waking near the end of a cycle is generally easier than waking in the middle of a deep-sleep phase.

What does the recommended option mean?

It's the option closest to the commonly cited healthy sleep range for adults, offered as a practical reference rather than a strict rule.