About SleepCalc

SleepCalc provides free, science-based sleep tools to help you understand and improve your rest. Our calculators use established sleep science models to deliver actionable recommendations.

Our Tools

• Calculate: Sleep cycle, bedtime, wake time, nap, and sleep debt calculators
• Analyze: Sleep quality scoring, efficiency analysis, chronotype quiz, and more
• Reference: Sleep charts, guides, and educational content

The Science

All our tools are based on peer-reviewed sleep research. The 90-minute sleep cycle model, the role of chronotypes, and the impact of factors like caffeine and screen time are all grounded in scientific evidence.

Contact

Have questions or suggestions? Visit our contact page to get in touch.