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Calculator Tools
Sleep Calculators

Nap Calculator

Best nap lengths (power nap, full cycle) and when to wake, including caffeine-nap timing.

Enter values

Results update as you type.

Result

Power nap (20 min) — wake at

14:30

A coffee right before a 20-minute nap gives the classic “caffeine nap” effect.

Short nap (30 min)
14:40
Full cycle (90 min)
15:40
Avoid
45–60 min (wakes you in deep sleep)

About the Nap Calculator

Best nap lengths (power nap, full cycle) and when to wake, including caffeine-nap timing.

Also known as: power nap calculator, nap length, best nap time.

How to use this calculator

  1. Enter nap starts at, 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

20 min for alertness · 90 min for a full cycle

Worked example

Using the values pre-filled in the calculator above:

  • Nap starts at: 14:00
  • Time to fall asleep = 10 min

the calculator returns:

  • Power nap (20 min) — wake at: 14:30
  • Short nap (30 min): 14:40
  • Full cycle (90 min): 15:40
  • Avoid: 45–60 min (wakes you in deep sleep)