Free Sleep Calculator — Bedtime and Wake-up Time
Enter when you must wake up, or when you go to bed.
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How to do it
- 1Choose your settings
Fill in the details or pick the options you need.
- 2See the result
The preview updates right away as you change things.
- 3Download or save it
Save the result to your device. Nothing is sent to or stored on a server.
About this tool
Wake up refreshed. Sleep happens in cycles of about 90 minutes, and waking at the end of a cycle usually feels easier. Enter your wake-up time to get bedtimes, or your bedtime to get wake-up times. About 15 minutes is allowed to fall asleep.
Frequently asked questions
How many cycles do I need?
Most adults need five or six cycles, which is 7.5 to 9 hours.
Is it exact?
No. Everybody is a little different. Use it as a guide.
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