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Sleep Calculators

Sleep Duration Calculator

How long you slept between bedtime and wake time, in hours and minutes, with sleep cycles completed.

Enter values

Results update as you type.

Result

Sleep duration

7 h 15 min

Hours
7.25
Sleep cycles (90 min)
4.8
Recommended for adults
7–9 hours

About the Sleep Duration Calculator

How long you slept between bedtime and wake time, in hours and minutes, with sleep cycles completed.

Also known as: how much did i sleep, sleep hours calculator, sleep time.

How to use this calculator

  1. Enter bedtime, wake time, time to fall asleep.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

Sleep = wake time − bedtime − time to fall asleep

Worked example

Using the values pre-filled in the calculator above:

  • Bedtime: 23:15
  • Wake time: 06:45
  • Time to fall asleep = 15 min

the calculator returns:

  • Sleep duration: 7 h 15 min
  • Hours: 7.25
  • Sleep cycles (90 min): 4.8
  • Recommended for adults: 7–9 hours