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Sleep Calculator

Ideal wake / bedtimes for full cycles.

Sleep cycles

Try going to bed at

  • 3 cycles · 4.5h sleep02:16
  • 4 cycles · 6.0h sleep00:46
  • 5 cycles · 7.5h sleep23:16
  • 6 cycles · 9.0h sleep21:46

Based on 90-min sleep cycles + 14 min to fall asleep.

Sleep Calculator · Generated 4/27/2026 · calcly.app/calculators/other/sleep

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About the Sleep Calculator

MethodologyHome

Ideal wake / bedtimes for full cycles. Use this free sleep calculator to get instant results. All calculations run in your browser — nothing is sent to a server.

Frequently asked questions

What does this Sleep Calculator do?

Ideal wake / bedtimes for full cycles.

Is it free?

Yes — every calculator on Calcly is free, with no sign-up or account required.

Does it work offline?

The site is a Progressive Web App — after your first visit, most pages work without an internet connection.