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Sleep Calculator
Find the best bedtime based on sleep cycles and wake time.
Optimal Sleep Cycles
It takes the average person 15 minutes to fall asleep. We've factored this into the times below. Aim for 5-6 cycles (7.5-9 hours).
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About This Calculator
The CalcWise Sleep Calculator gives you instant, accurate results right in your browser. All calculations happen locally — we never store or transmit your data. Whether you're on desktop or mobile, this free tool is always available with no signup required.
Frequently Asked Questions
One sleep cycle lasts about 90 minutes, including light sleep, deep sleep, and REM stages.
Adults need 7-9 hours (4-6 complete sleep cycles) for optimal health and performance.
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