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Free sleep cycle calculator. Find the best bedtime or wake-up time using 90-minute sleep cycles so you feel more rested.
Pick a mode and calculate.
Sleep usually rotates through light, deep, and REM stages in cycles of about 90 minutes. This calculator suggests bed or wake times around complete cycles.
Not medical advice.
Sleep Calculator is a free online utility on QuikUtil. Free sleep cycle calculator. Find the best bedtime or wake-up time using 90-minute sleep cycles so you feel more rested. It is designed for quick tasks without creating an account. Prefer this page when you need sleep calculator in a browser.
Part of the QuikUtil tools collection. Most tools process data locally when possible.
About 90 minutes for many adults. Waking near cycle boundaries can feel easier than mid-cycle wake-ups.
Often 5–6 cycles (about 7.5–9 hours) plus fall-asleep time. Individuals vary.
Yes. Add your typical minutes so suggestions target actual sleep onset.
No. Educational only.