Circadian Rhythm Calculator

Free calculate optimal sleep and wake times based on circadian rhythm. Get instant, accurate results with our easy-to-use calculator.

Sleep Preferences

Results

Enter preferences to calculate sleep times

About Circadian Rhythm

  • • Sleep cycles are approximately 90 minutes
  • • Waking between cycles reduces grogginess
  • • Most adults need 5-6 cycles (7.5-9 hours)
  • • Individual needs vary