Sleep Calculator
Find the ideal bedtime for good sleep cycles. Free online calculator with instant results — no login needed.
Sleep Cycles
Bedtime (approx.)
What is the Sleep Calculator?
Find the ideal bedtime for good sleep cycles. Free online calculator with instant results — no login needed.
Enter your values above and the result updates instantly. Adults need 7–9 hours of sleep.
Formula
About 5–6 cycles of 90 minutes each
Example
Bedtime (approx.)
Sleep Cycles
FAQs
How long is a cycle?
About 90 minutes.
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