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Bedtime Alarm Calculator
Work out the best time to sleep or wake up using 90-minute sleep cycles, then set the alarm in one tap.
About Bedtime Alarm Calculator
Waking up in the middle of a sleep cycle is what makes you groggy. Bedtime Alarm Calculator works backwards from the time you need to be up, or forwards from the time you are going to bed, and gives you the times that land at the end of a complete 90-minute cycle.
It is deliberately a single-purpose tool: no account, no tracking, no background service draining your battery. It hands the alarm off to your phone's own alarm app.
Screenshots
Key features
- Calculate the best bedtimeChoose your wake-up time and get several recommended bedtimes, each showing the number of complete sleep cycles and total sleep duration.
- Calculate the best wake-up timeGoing to bed now? Enter your bedtime and get healthy wake-up options based on cycle intervals.
- One-tap alarm creationTap the alarm button and your device's alarm app opens pre-filled with the time you picked.
- Multiple cycle optionsSee 4, 5, 6 and extended sleep-cycle suggestions side by side with duration and cycle count for each.
- Battery friendlyUses your phone's built-in alarm rather than running its own background service.
Who it's for
- Students planning around early lectures
- Shift workers with irregular schedules
- Professionals trying to fix a sleep routine
- Anyone who wakes up groggy despite enough hours
Built with
- Flutter
- Dart
- Android Alarm Intents
Want an app built on this stack? See how I work or get in touch.
Frequently asked questions
Why 90 minutes?
A full sleep cycle averages roughly 90 minutes. Waking near the end of a cycle, rather than in the middle of deep sleep, is what tends to leave you feeling more refreshed.
Does the app set the alarm itself?
It opens your device's own alarm app pre-filled with the chosen time, so your alarm behaves exactly as it normally does and no extra battery is used.
Does it track my sleep?
No. It is a calculator, not a sleep tracker. It does not need microphone or motion access.
Is it free?
Yes, free on Google Play.
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View app detailsNeed an app like Bedtime Alarm Calculator?
I build this kind of product end to end — design, Flutter development, Firebase backend, Play Store submission and ongoing maintenance.