Sleep Cycle Calculator

Find your perfect sleep window.

Calculate optimal bedtimes and wake-up times based on 90-minute sleep cycles. Choose your mode and let the math do the work.

Sleep Cycle Calculator

Tell us about your sleep.

Fill in your details below and we'll find your best sleep windows.

What do you want to calculate?

When do you plan to go to bed?

Your Age Group

Recommended sleep: 7–9 hours

Advanced Settings

Cycle Length 90m

Default: 90 minutes. Normal range: 85–110m.

Fall-asleep Buffer 14m

"I usually fall asleep in _ minutes." Default: 14m.

✓ Alarm time copied!