Free bedtime calculator
What time should I go to bed?
Choose the time you must wake up and our calculator will show several suggested bedtimes. The estimates use 90-minute planning intervals and allow about 15 minutes to fall asleep.
Calculate your bedtime now
Open the calculator, select your wake-up time and choose the option that gives you enough total sleep.
Use the sleep calculatorHow the bedtime calculator works
The tool counts backwards from your alarm time in estimated sleep-cycle blocks. Earlier results provide more total sleep; later results are shorter options for nights when your schedule is limited.
- Select the hour and minute you need to wake up.
- Choose AM or PM and calculate your bedtimes.
- Prefer an option that provides at least the recommended amount of sleep for your age.
Sleep cycles vary between people and throughout the night. These times are estimates, not a way to detect your actual sleep stage.
Example: waking at 7:00 AM
With a 15-minute settling-in allowance, common cycle-based suggestions include approximately 9:45 PM for six cycles or 11:15 PM for five cycles. Your ideal time may differ depending on sleep needs and how quickly you fall asleep.