The Best Online Sleep Calculators

Getting the right amount of sleep each night can help set you up for a great day. Online sleep calculators are a useful tool that can help you optimize your nightly sleep.

By Nicole Gleichmann

The National Sleep Foundation recommends for adults to clock between 7 and 9 hours of sleep each night. However, simply sleeping within that range doesn’t guarantee that you’ll wake up feeling refreshed. To do this, you will want to concentrate on exactly how long you spend slumbering.

Every night your body cycles through multiple stages of sleep, including light sleep, deep sleep, and REM (Rapid Eye Movement) sleep. It’s best for most adults to get between 4 and 6 full sleep cycles each night, with each of these cycles lasting roughly 90 minutes. The tricky part is this: you want to wake up between sleep cycles. If you wake up during the wrong stage of sleep, you’re likely to wake up feeling groggy.

There are many sleep calculators available online that are designed to help you do just that, but they’re not all perfect. Some can provide you with incomplete or inaccurate information, so you want to be careful when you select a sleep calculator.

We’ve compiled a list of our 5 favorite sleep calculators that you can find online for free.

Best Sleep Calculator for the Whole Family

If you want a calculator that you can use to figure out the bedtimes for people of all ages, try Because humans need different hours of nightly sleep depending on age, this calculator can be incredibly valuable for coming up with a sleep routine for your whole family.

Best Simple Sleep Calculator offers our favorite sleep calculator that’s straightforward and easy-to-use. Here you can enter in your wake up time and be given a general recommendation for when to go to bed at night. It’s based on getting 5-6 sleep cycles each night, which is a good goal for most adults

The Most Comprehensive Sleep Calculator provides our favorite sleep calculator online. It’s easy to use and provides comprehensive information on multiple aspects of sleep. Plus, it has you enter in how long it takes you to fall asleep. This allows for a more personalized recommendation than most sleep calculators.

Best Sleep Calculator for Naps has the only calculator that we found that includes 4 different options:

  1. Bedtime based on when you wake up
  2. Wake up time based on when you go to sleep
  3. Wake up time if you go to sleep now
  4. Wake up time if you take a power nap now

This makes it a great one-stop shop for all of your sleep-timing needs. Not to mention, they offer a lot of helpful education regarding things like sleep needs by age and tips and tricks for falling asleep and waking up.

The Ideal Sleep Calculator for Analytical Thinkers

Are you the type of person who enjoys learning about the whys and the hows? If so, try the sleep calculator on This site doesn’t have a traditional calculator—one where you enter the info and it spits out the answer for you—instead, it gives an explanation and equation that you can use to determine your sleep schedule.

Don’t Forget Sleep Quality

One word of caution: ensuring a good night’s sleep consists of more than just when you go to bed and when you wake up. Your sleep quality is also important. Try to take steps to not only ensure that you spend enough time in bed, but that you sleep well throughout the night too.

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