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Sleep calculator

Lists bedtimes or wake times in sleep-cycle multiples adjusted for how long you take to fall asleep, checked against age-group guidance.

Pick a time to plan around.

Each listed time is when the light should already be off, fall-asleep minutes included; the sleep hours counted are the cycles alone. Cycles of about 90 minutes are a population average, and the recommended ranges are broad guidance for age groups, not a medical target. If a listed bedtime is already past, the matching option is the one that lands tomorrow.
Options

More time & date tools

- Stopwatch and countdown (/time/stopwatch)
- Duration converter (/time/duration-converter)
- Reading time planner (/time/academic-reading-time-calculator)
All time & date tools (/time)

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Canonical HTML: https://nutter.tools/time/sleep-calculator
Markdown version: https://nutter.tools/time/sleep-calculator.md
Plain-text version: https://nutter.tools/time/sleep-calculator.txt
Agent index: https://nutter.tools/llms.txt