Sleep Calculator
When you need to check sleep, the Sleep gives you a clear starting point. Enter one realistic example first, then compare another option if useful.
Go to bed at one of these
—
6 cycles (9 h)—
5 cycles (7.5 h)—
4 cycles (6 h)—
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How it works
Bedtime = wake time − (cycles × 90 min) − 15 min to fall asleepHow to use the Sleep
Enter the requested values and start with one realistic example. Read the result together with its unit or label, then change one input at a time if you want to compare options.
This is a general estimate and cannot replace advice from a qualified health professional.
Frequently Asked Questions
How does the Sleep Calculator work?
Pick a wake-up time to see good bedtimes based on 90-minute sleep cycles (plus time to fall asleep).
Is this medical advice?
No. It gives general estimates only. For decisions about your health, speak with a qualified professional.
Can I use the result as an exact answer?
Treat it as an estimate or check unless the page and the rules that apply to you confirm otherwise. Rounding, fees and personal details can change the final result.