Sleep Cycle Bedtime Calculator

Name: Sleep Cycle Bedtime Calculator
Rating: 4.1 (306 reviews)
Author: Kai Oelfke

Wake Up & Bed Time Schedule

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

306 Ratings
Age Rating

9+
Years
Category

Health & Fitness
Developer

Kai Oelfke
Language

EN
+ 31 More
Size

36.5
MB

Plan your bedtime, calculate wake-up options, and explore your sleep history with Sleep Calc for iPhone and Apple Watch. No account or sign-up required. Find a time that fits Enter your wake-up time to see bedtime options, or enter your bedtime to see wake-up options. Adjust the time you need to fall asleep and the range of sleep cycles shown. Calculate on Apple Watch Check bedtime and wake-up options from your wrist. Your calculator settings sync between your iPhone and paired Apple Watch. Review your sleep history Connect Apple Health to view sleep records from your Apple Watch or other compatible apps. Explore your sleep duration, bedtime consistency, interruptions and Sleep Scores with summaries and charts. The most recent 14 days are available for free. Full available sleep history requires Sleep Calc Pro. Set bedtime and wake-up alarms Create alarms from your calculated times, edit their times and labels, choose repeat days and select an alarm sound. Requires Sleep Calc Pro and an iPhone or iPad running iOS 26 or iPadOS 26 or later. Purchases and subscriptions Additional paid features are available through one-time purchases and auto-renewable subscriptions. Available options, included features, and prices are shown in the app before purchase. Subscriptions renew automatically unless canceled. You can manage or cancel them in your App Store account settings. About the estimates The calculator uses fixed 90-minute cycle estimates; actual sleep cycles vary. It does not measure or predict your sleep stages. Sleep Scores summarize the sleep data available in Apple Health and are not a medical assessment. Privacy Policy: https://sleepcycles.carrd.co/#privacy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Ratings & Reviews

4.1

out of 5

306 Ratings

JimSpeedy1dino
11/28/2024
Lake Jim
Where I found this app helpful is, I noticed I naturally wake up near 7:40 am most days. If that’s normal for me, then I might consider being in bed by a certain time. It is something to try for be better sleep health. The app offers two choices.

Developer Response
It’s very good to keep bed and wake up time consistent for your body. Thank you for the review. Best, Kai
JimSpeedy1dino
11/28/2024
Lake Jim

Where I found this app helpful is, I noticed I naturally wake up near 7:40 am most days. If that’s normal for me, then I might consider being in bed by a certain time. It is something to try for be better sleep health. The app offers two choices.
Developer Response 11/30/2024
It’s very good to keep bed and wake up time consistent for your body. Thank you for the review. Best, Kai
Doesn’t actually do anything
04/07/2024
Wendyannh
All this app does is tell you how many hours of sleep you’ll get at 6 possible times based on what time you tell it you want to go to bed, or the exact reverse, what time you need to go to bed if you want to wake up at a particular time and want to get X hours of sleep. IOW, all it does is 1st grade arithmetic, which you can obviously easily count yourself, whether forwards or backwards, by just adding or subtracting X hours from your desired bedtime or wake up time. It actually skips two hour twice in each section, so if you want a time in between those pairs, you’ll have to manually calculate it anyways. In fairness, that’s really all it says it will do, and the changes are instant, as you turn the dial. The problem is the app came up when I searched on “sleep tracker” - and it just doesn’t actually track anything at all, so it seems that the developer has miscategorized it. But s/he *did* say it’s a sleep tracker, so the fact that it definitely isn’t what I’m basing my stars on. *And* the thing about the skipped hours.

Developer Response
I am sorry for the confusion Wendy. I don’t categorize or describe the app as a sleep tracker. It’s as you found out a simple calculator. Some people find it convenient instead of doing the math themselves. Apple‘s search algorithm automatically decides to put my app for sleep tracker. It’s not my fault and I can’t do anything against that. The rows are based on sleep cycles, which are 90 minutes. So that’s why it’s not listing each hour. According to some sleep research it‘s better to wake up after a multiple of 90 minutes instead of in between a sleep cycle. If you can consider editing your rating it’ll help people, who’re looking for a simple sleep time calculator like my app.Here’s the description, which doesn’t mention sleep tracking:Sleep smarter. Feel more refreshed. Calculate the best time to wake up or when to go to bed. It's based on sleep cycles. They're about 90 minutes each and it's good to get 5-6 cycles. Sleeping at midnight for 5 cycles? Wake up at 7:30 AM. Need to wake up at 6:00 AM, but want 6 cycles? Then hit the bed at 9:00 PM. Not falling asleep immediately? Customize your fall asleep time. PS: Most people need ~ 15 minutes to fall asleep.- Apple Watch support- Customize time to fall asleep
Doesn’t actually do anything
04/07/2024
Wendyannh

All this app does is tell you how many hours of sleep you’ll get at 6 possible times based on what time you tell it you want to go to bed, or the exact reverse, what time you need to go to bed if you want to wake up at a particular time and want to get X hours of sleep. IOW, all it does is 1st grade arithmetic, which you can obviously easily count yourself, whether forwards or backwards, by just adding or subtracting X hours from your desired bedtime or wake up time. It actually skips two hour twice in each section, so if you want a time in between those pairs, you’ll have to manually calculate it anyways. In fairness, that’s really all it says it will do, and the changes are instant, as you turn the dial. The problem is the app came up when I searched on “sleep tracker” - and it just doesn’t actually track anything at all, so it seems that the developer has miscategorized it. But s/he *did* say it’s a sleep tracker, so the fact that it definitely isn’t what I’m basing my stars on. *And* the thing about the skipped hours.
Developer Response 04/09/2024
I am sorry for the confusion Wendy. I don’t categorize or describe the app as a sleep tracker. It’s as you found out a simple calculator. Some people find it convenient instead of doing the math themselves. Apple‘s search algorithm automatically decides to put my app for sleep tracker. It’s not my fault and I can’t do anything against that. The rows are based on sleep cycles, which are 90 minutes. So that’s why it’s not listing each hour. According to some sleep research it‘s better to wake up after a multiple of 90 minutes instead of in between a sleep cycle. If you can consider editing your rating it’ll help people, who’re looking for a simple sleep time calculator like my app.Here’s the description, which doesn’t mention sleep tracking:Sleep smarter. Feel more refreshed. Calculate the best time to wake up or when to go to bed. It's based on sleep cycles. They're about 90 minutes each and it's good to get 5-6 cycles. Sleeping at midnight for 5 cycles? Wake up at 7:30 AM. Need to wake up at 6:00 AM, but want 6 cycles? Then hit the bed at 9:00 PM. Not falling asleep immediately? Customize your fall asleep time. PS: Most people need ~ 15 minutes to fall asleep.- Apple Watch support- Customize time to fall asleep
Perfect
10/20/2025
ZachAttack316
I like how I can easily see what time I should go to bed or what time I should wake up based on my cycles. I have noticed that I’m not as drowsy in the morning (if I follow it and go to bed). It would be cool to eventually be able to see more data from Apple in the app like if my cycles align with the typical 90 minutes but for now I’m not complaining. Thanks for this app!

Developer Response
Thank you! Best, Kai
Perfect
10/20/2025
ZachAttack316

I like how I can easily see what time I should go to bed or what time I should wake up based on my cycles. I have noticed that I’m not as drowsy in the morning (if I follow it and go to bed). It would be cool to eventually be able to see more data from Apple in the app like if my cycles align with the typical 90 minutes but for now I’m not complaining. Thanks for this app!
Developer Response 10/23/2025
Thank you! Best, Kai
My new favorite
11/29/2025
occasional downloader
I like that it in addition to the times to wake up, shows the number of hours you’ll get, and highlights the two best ones for a full night’s sleep. And I love that it doesn’t collect any data or otherwise compromise user privacy—and that it’s FREE.

Developer Response
Thank you! Best, Kai
My new favorite
11/29/2025
occasional downloader

I like that it in addition to the times to wake up, shows the number of hours you’ll get, and highlights the two best ones for a full night’s sleep. And I love that it doesn’t collect any data or otherwise compromise user privacy—and that it’s FREE.
Developer Response 12/06/2025
Thank you! Best, Kai

Bug fixes and stability improvements

Version 1.0.13 Oct 12

Data Not Linked to You

The following data may be collected but it is not linked to your identity:
- Purchases
- User Content
- Identifiers
- Usage Data
- Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Supported Features
- Dark Interface

Information

Seller: Kai Oelfke
Size: 36.5 MB
Category: Health & Fitness
Compatibility: Requires iOS 18.0 or later.

iPhone
Requires iOS 18.0 or later.

iPad
Requires iPadOS 18.0 or later.

Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later.

Apple Vision
Requires visionOS 2.0 or later.

Apple Watch
Requires watchOS 11.0 or later.
Languages: English and 31 more

English, Arabic, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
Age Rating: 9+

9+

Learn More

Contains
Health or Wellness Topics
In-App Purchases: Yes

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