We may earn commission from the links on this page.
Credits: Screenshots courtesy of Ora, Apple, Whoop, and Garmin.
Sleep score may be one of the most scrutinized metrics in wearable health tracking, but the companies behind it haven’t agreed on a common language. A Garmin wearer with the 75 is in “reasonable” territory. A person wearing an aura with 75 is doing “well”. An Apple Watch user with a 75 may see “OK” or “High”, depending on what software version they’re running. Where are these numbers coming from and what are they really telling you?
Each platform uses different scales, labels, and underlying signals to arrive at that single morning number. Here’s how the most popular wearable devices calculate your “sleep score” and what that score means for you.
What does your “Sleep Score” really mean?
For all of the scoring systems below, know that it is impossible for a sleep score to be truly “accurate.” Your device tracks how long you were asleep, and estimates how much of that time was spent in light sleep, deep sleep, and REM sleep. Then, it breaks this down into an overall score, which may have more to do with branding decisions than clinical science.
So while the data that’s going into your score (like your heart rate). Be precise, it is important to understand that the score itself is a made up number. Sleep tracking, at its best, works less like a medical test that you pass or fail, and more as a way to see patterns over time.
How Oura Ring Calculates Your Sleep Score
Let’s start with Ora, as it is widely considered the best sleep tracker. Ora’s Sleep Score Range from 0 to 100 with three broad areas for scoring:
-
85-100: optimal. 85 or higher means all of your metrics appear reasonably healthy. Ora also marks the day with a crown icon in the app.
-
70-84: good. Your sleep was good, but not very good. You’re adequately rested and ready for most daily activities, but there’s still room for improvement in your overall sleep quality.
-
Less than 70: Pay attention. A score below 70 indicates that you may benefit from prioritizing rest and recovery.
According to Ora, your sleep score is made up of seven contributors: total sleep time, sleep efficiency (percentage of time actually asleep), restfulness, REM sleep, deep sleep, sleep latency (how long it takes to fall asleep), and timing (whether your sleep aligns with your body’s natural circadian rhythm).
aura is shown This is the most accurate of all the wearables on this list, mainly because it reads from your finger, which provides a stronger optical signal than the wrist.
An important note: a score of 100 is designed to be rare rather than regular. If you’re never getting 85 points, that’s not unusual either. Sleep naturally fluctuates, and there may be times when your sleep is better or worse. Again, it is more useful to be interested in your trends over time rather than on any one night.
How does Whoop calculate your sleep score
Whoop gives you two numbers—A sleep display percent and a recovery Score—and it expects you to read them together.
sleep display It is expressed as a percentage from 0-100%, showing how much sleep your body needed versus what you actually got. It is calculated using sleep adequacy (the percentage of required sleep you got), sleep consistency (comparing the amount of time you slept compared to the previous four nights), sleep efficiency (the percentage of time you actually spent sleeping in bed), and sleep strain (the amount of time spent in a state of physiological high stress during the night).
recovery There is a broader daily readiness score, also expressed as a percentage, and it is the number that most Whoop users check first. Recovery is color-coded into three zones: green (67-100%) means you are well recovered and ready to perform; Yellow (34-66%) means your body is healthy and prepared for moderate stress; Red (0-33%) indicates that your body probably needs rest.
Whoop says it compares your metrics to your own baseline rather than a fixed population standard, which means your 70% recovery and a friend’s 70% recovery may reflect completely different situations.
Whoop stands to avoid a single “sleep was good/bad” judgment. The sleep performance percentage tells you about the amount and consistency relative to your individual need, while the recovery score tells you how your body responded. Most people consider Whoop and Ora to be tough competition for top sleep trackers.
How does garmin calculate your sleep score
Now onto smartwatches. Garmin offers perhaps the most traditional scoring system of the group. Each morning you receive a sleep score on a 0-100 scale, and based on that score, you are assigned one of four rankings:
-
90-100: excellent
-
80-89: good
-
60-79: fair
-
Below 60: Bad
For Garmin, a nighttime sleep score is calculated based on a mix of how long you slept, how well you slept, and “evidence of recovery activity occurring in your autonomic nervous system derived from heart rate variability data.” That last point should mean that the Garmin tracks changes in the time between heartbeats during sleep, and factors in when scoring your overall sleep quality. Theoretically, the reason for this should be something like your nervous system staying elevated all night, even if you are physically immobile.
The Garmin also has a body battery reading, which shows how well your energy reserves recharged overnight. This comes from a combination of your heart rate, heart rate variability (HRV), and motion data. When your sleep score is low, your body battery usually also goes down.
The Garmin (along with the rest of the smartwatches below) is probably considered the best smartwatch Happens To track sleep, unlike dedicated sleep trackers like Oura or Whoop.
What do you think so far?
How the Apple Watch calculates your sleep score
Apple’s Sleep Score is the newest entry on this list, arriving in September 2025. But even with this most recent update, Apple’s sleep score is considered too generous.
Your score is calculated based on sleep duration (equivalent to 50 points), consistency of bedtime (equivalent to 30 points), and interruptions – how often you wake up and how long you stay awake (equivalent to 20 points). The current five-level scale, as updated in watchOS 26.2, looks like this:
Compared to other trackers on this list, Apple’s score appears to focus on habits Instead of trying to focus on sleep stages, focus around sleep (enough hours, consistent time, minimal waking).
How does Fitbit calculate your sleep score?
Fitbit was one of the first mainstream wearable devices to offer official sleep scores, and its system remains quite clean and consistent. Your overall sleep score is the sum of the individual scores in sleep duration, sleep quality, and restorativeness, for a total score up to 100. fitbit says Most people score between 72 and 83.
Four Range:
-
90-100: excellent
-
80-89: good
-
60-79: fair
-
Below 60: Bad
fitbit defines sleep duration Total sleep time relative to your goals; sleep quality It measures how much time you spend in deep and REM stages; And repair (The most specific element) looks at your sleeping heart rate versus your daytime resting heart rate and how much time you spend tossing and turning. A high recovery score occurs when your sleeping heart rate drops meaningfully below your resting heart rate.
One thing: To see a detailed breakdown of your Restore scores, you need a Fitbit Premium subscription. Basic users see the total score, but the granular component breakdown is paid.
What does 75 points mean on each platform?
Just for fun, let’s see how these different companies interpret the same numbers. Depending on your wearable, what 75 could mean:
-
Ora: Good sleep, adequate rest.
-
Garmin: Fair, meaning some things could be better.
-
Apple Watch: Just above the midpoint of the “OK” level.
-
Fitbit: Near the top of “Fair,” bottom of the “Good” range.
-
Whoop: Not directly comparable, since it’s percentage-based).
bottom line
No sleep score is a clinical measurement on any of these platforms. They are estimates derived from wrist (or finger) sensors, algorithms built on population data, and proprietary definitions that no company fully discloses. Two people who sleep the same way may have different scores, and the same person may score 90 one night and 65 the next, with no apparent explanation.
Again, the more useful way to read these numbers is as an indication of trends over time, not an overnight decision. To get the most out of your sleep scores, I’m here to explain the best methods of sleep tracking.
