Sleep Calculator
Plan bedtimes or wake-up times using full sleep cycles and fall-asleep time.
Inputs
Results
Calculated bedtime
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Calculated wake-up time
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Total time in bed
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Latency + (cycles × cycle length)
Estimated sleep duration
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Cycles × cycle length
Calculation mode used
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Based on your selected mode and time input.
Day note
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Shows whether the result falls on the same day, previous day, or next day.
Popular cycle options
Click Calculate to generate cycle-based schedule options.
Guidance
Enter a wake-up time or bedtime, then click Calculate.
Formula used: total time in bed = fall-asleep time + (number of cycles × cycle length).
This calculator uses an approximate cycle model. Real sleep cycles vary by person and by night.