Health & Fitness
Sleep Calculator
Find ideal bedtimes based on sleep cycles.
Created and maintained by: CalcTago Editorial TeamLast updated: 2026-02-13
Formulas and edge cases are reviewed against authoritative references before publication. For methodology, editorial standards, or corrections, use the links below.
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Frequently asked questions
How are bedtimes calculated?
We use 90-minute sleep cycles plus 15 minutes to fall asleep.
How many cycles should I aim for?
Most adults feel best with 4-6 sleep cycles.
Does this replace medical advice?
No. Use it as a guide and consult a professional for sleep issues.
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About this tool
This Sleep Calculator turns your inputs into practical results. Provide Wake-up time to calculate Recommended bedtimes.
Adjust values to compare scenarios and see how sensitive the result is. The calculation uses the numbers as entered, so double-check units and expect small differences from rounding in the displayed totals.