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Sleep Calculators

Sleep Efficiency Calculator

Sleep efficiency: time actually asleep as a percentage of time in bed — 85%+ is considered good.

Enter values

Results update as you type.

Result

Sleep efficiency

85.11%

Good sleep efficiency (85%+).

Step-by-stepShow
  1. Sleep efficiency = 400 ÷ 470 × 100 = 85.1064%

About the Sleep Efficiency Calculator

Sleep efficiency: time actually asleep as a percentage of time in bed — 85%+ is considered good.

Also known as: sleep quality percentage, time in bed, sleep efficiency formula, time-in-bed.

How to use this calculator

  1. Enter minutes asleep, minutes in bed.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Open “Step-by-step” to see how the answer was worked out.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

Sleep efficiency = Minutes asleep ÷ Minutes in bed × 100

Worked example

Using the values pre-filled in the calculator above:

  • Minutes asleep = 400
  • Minutes in bed = 470

the calculator returns:

  • Sleep efficiency: 85.11%

Working

  1. Sleep efficiency = 400 ÷ 470 × 100 = 85.1064%