Free Sleep Duration Calculator Online — Calculate total sleep hours and quality
Sleep Duration Calculator
How to Use the Sleep Duration Calculator
Enter your bedtime and wake time to calculate total sleep duration, number of complete 90-minute sleep cycles, and overall sleep quality.
How many hours of sleep do I need?
Adults need 7-9 hours (4-6 complete sleep cycles). Waking at the end of a cycle helps you feel more refreshed.
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