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Sleep calculator
The best times to go to bed or wake up, in 90-minute sleep cycles.
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- Works on any device
About Sleep calculator
Pick a wake-up time and see the best bedtimes, or enter a bedtime to see when to wake. A sleep cycle lasts about 90 minutes, and waking at the end of a cycle usually feels easier than mid-cycle. Add roughly 15 minutes for the time it takes to fall asleep.
How to use Sleep calculator
- Choose whether to find a bedtime or a wake-up time.
- Enter the time you want to wake up or go to bed.
- Pick one of the suggested times that fits 90-minute cycles.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Free to embed on your own website, with a ready-made code to copy.
- Available in 10 languages.
Also known as
Frequently asked questions
How many sleep cycles do I need per night?
Most adults feel best with five or six cycles, which is about 7.5 to 9 hours. Individual needs vary.
Why 90-minute cycles?
Sleep moves through stages in cycles averaging about 90 minutes. Waking at the end of a cycle often feels easier than waking in the middle of one.
Should I add time to fall asleep?
Yes, it takes most people several minutes to fall asleep. Allow for that when choosing your bedtime.
Is Sleep calculator free?
Yes. Sleep calculator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.
Can I put Sleep calculator on my own website?
Yes. Use the Embed on your site button under the tool to copy a short piece of code and paste it into your page. It is free, needs no account, and the tool keeps working inside your page.