Sleep Calculator

Health & Fitness

★★★★★ 4.1

Installs

100,000+

Price

Free

Developers

DealWatch24 LLC

Content Rating

Everyone

Android Version

5.0

Version

1.2.129

Sleep Calculator APP Download

Good day starts with good morning! With Sleep Calculator, you can optimize your sleep schedule to wake up rejuvenated and refreshed. The app centers around the idea of aligning your sleep with your natural 90-minute sleep cycles, helping you achieve a good night’s sleep consisting of 5-6 complete cycles.

Simply select a desired wake-up time, and let the app calculate your ideal bedtime. It smartly accounts for the average 15 minutes it takes to fall asleep, ensuring you rise when your body is ready. Additionally, you can track your sleep cycles with the Sleep Tracker feature, gaining insights into your light, deep, and REM (dream) phases, along with snoring detection.

Moreover, the new Smart Alarm feature will gently wake you during your lightest sleep phase, ensuring a pleasant start to your day. Bedtime notifications will also alert you when it’s time to get some rest, so you never miss your optimal sleep window.

While the app has received praise for its user-friendly interface and effectiveness, some users have faced bugs and issues with alarm volumes and crashes. As such, it’s important to check for updates regularly for an improved experience.

In conclusion, Sleep Calculator offers a valuable tool for anyone looking to enhance their sleep quality through calculated timings. It's a free app, making it an accessible option for those keen on mastering their sleep schedules.

User Reviews from Google Play Store

Stinky Billy

Feb 3, 2026

★★★★★(5)

as a night shift worker I find this helps

Version: 1.2.129

My Online Logins Karin

Dec 14, 2025

★★★★★(5)

THE best free app for Sleep Calculation. I've used several paid ones in the past. Yet, this free app (without annoying adds) is much better!

Rochelle Dickson

Dec 3, 2025

★★★★★(5)

I love this app so much. I've used it literally almost every day for years. its extremely useful. I struggle with extreme morning grogginess, which can lead to oversleeping and being late or missing work, events, appointments all together. this app helps avoid that stress because I'm no longer trying to wake up in the middle of my sleep cycle, which is avoiding as much grogginess as possible. I am also very bad at math so it helps me that I can just quickly check what time to set my alarm. LOVE

Version: 1.2.129

Zhenya Zhy

Oct 6, 2025

★★★★★(1)

This app is truly badly designed. It is full of bugs. The alarm volume is too quiet and there is no way to increase it. Sometimes the alarm doesn't sound at all. In it's current state in the app is completely and utterly useless.

Version: 1.2.129

cameron cohen

Sep 21, 2025

★★★★★(4)

pretty great app, the times add up well and I do wake up easier at the times they say (it does have a tendency to mute my other alarms and prioritize its own alarm sound, which isn't enough to wake me up) my biggest complaint with this app is that you can't change the background color. the shade of cyan blue they chose is the exact color used in nature to wake you up. which isn't helpful if I'm trying to figure out when I need to go to sleep tonight and now I'm wide awake cuz I opened the app

Version: 1.2.129