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SleepCalc icon

SleepCalc

Free web-based sleep calculator that instantly suggests ideal bed- and wake-up times using 90-minute cycles and circadian-rhythm science—no downloads or sign-ups required.

A dark-themed “Sleep Calculator” interface shows a wheel-style time picker. The user selects the time they want to wake up (tab highlighted in purple) and scrolls hours-minutes-AM/PM columns. A prominent purple button labeled “Calculate Bedtime” sits beneath the picker, with a note: “Based on 90-minute sleep cycles – It takes the average person 15 minutes to fall asleep.”
After tapping Calculate, the app reveals a “Suggested Bedtimes” section. It lists three color-coded cards—for example 9:15 PM (9 h • Ideal for recovery), 10:45 PM (7 h 30 m • Optimal), and 12:15 AM (6 h • Minimum)—each accompanied by an icon indicating sleep-quality level. A brief “Sleep Quality Guide” legend appears at the bottom to explain the color codes.

Cost / License

  • Free
  • Proprietary

Platforms

  • Online
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SleepCalc was added to AlternativeTo by Desmondos on and this page was last updated .
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What is SleepCalc?

SleepCalc helps you wake up alert instead of groggy. Enter the time you plan to go to bed—or the time you must wake up—and the app returns several scientifically timed options based on 90-minute sleep cycles plus a 15-minute fall-asleep buffer.

  • Zero friction: works in any browser, mobile-first, no login.
  • Evidence-based: built on peer-reviewed circadian research.
  • Accessible: totally free; no ads or tracking cookies.
  • Road-map: nap-length calculator, shift-work scheduler and jet-lag mode coming soon.

Perfect for students, shift workers, travelers and anyone who wants a quick, science-backed answer to “When should I go to sleep or wake up?”