😴

Sleep Calculator

Find optimal bedtimes and wake times based on 90-minute sleep cycles.

I want to wake up at

Recommended bedtimes to wake at :

If you fall asleep right now, wake up at one of these times:

Based on 90-minute sleep cycles. Waking at the end of a cycle means you feel more refreshed. Allow ~15 minutes to fall asleep.

Your files are processed securely and automatically deleted after 1 hour. We never store or share your data.

About Sleep Calculator

Our free Sleep Calculator helps you run quick, accurate calculations for everyday financial and mathematical needs with just a few inputs. Find optimal bedtimes and wake times based on 90-minute sleep cycles. Enter your values, and the calculator instantly shows detailed results with breakdowns you can understand. No signup, no ads interrupting your workflow — just accurate, reliable calculations you can trust. Works on any device, saves nothing to our servers.

📖