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Sleep Calculator

Calculate optimal bedtimes, wake-up times and estimate your sleep debt using neuroscience-based sleep cycles. No login required.

Bedtime Calculator

What time do you need to wake up?

Recommended Bedtimes
Best8 hours 15 minutes
9:45 PM
6 sleep cycles
9 hours 15 min total
Good6 hours 45 minutes
11:15 PM
5 sleep cycles
7 hours 45 min total
Minimum5 hours 15 minutes
12:45 AM
4 sleep cycles
6 hours 15 min total
Based on 90-minute sleep cycles and an average 15-minute sleep onset. Results are estimates for educational purposes.
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This tool is for educational and planning purposes only. It does not provide medical advice, diagnosis or treatment. Consult a qualified healthcare professional for persistent sleep problems.