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Sleep Calculator

This free Sleep Calculator helps you find the best bedtime or the best wake-up time using sleep cycles (typically ~90 minutes) plus a realistic fall-asleep buffer. Use it to wake up during a lighter sleep phase, reduce grogginess, and build a sleep schedule you can actually stick to.

⏰Ideal bedtimes & wake times in seconds
🌀Sleep-cycle math (customizable)
📊Sleep duration + “wake-up smoothness” score
📱Perfect for screenshots & sharing

Plan your sleep

Choose what you’re planning: wake up at a certain time or go to bed at a certain time. We’ll calculate the best times based on sleep cycles + your fall-asleep buffer.

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Your sleep plan will appear here
Pick a wake-up time (or bedtime) and tap “Calculate Sleep Times”.
Tip: waking up at the end of a sleep cycle often feels smoother than waking mid-cycle.
Sleep score: 0 = rough / short · 50 = okay · 100 = strong, cycle-aligned sleep.
ShortOkayGreat

This Sleep Calculator is for informational purposes only and does not replace medical advice. If you have persistent sleep problems, consider speaking with a clinician.

MaximCalculator provides simple, user-friendly tools. Always treat results as entertainment and double-check any important numbers elsewhere.