Sleep scores may be one of the most-checked metrics in wearable health tracking, but the companies behind them haven't agreed on a shared language. A Garmin wearer with a 75 is in "Fair" territory. An Oura wearer with a 75 is doing "Good." An Apple Watch user with a 75 might see "OK" or "High" depending on which software version they're running. Where are these numbers coming from, and what are they actually telling you?
Each platform uses different scales, labels, and underlying signals to arrive at that single morning number. Here's a breakdown of how the most popular wearables calculate your "sleep score," and what that score means for you.
Oura Ring 4 $349.00 at Amazon Shop Now Shop Now $349.00 at AmazonSo while the data that is going into your score (like your heart rate) might be accurate, it's important to understand that the score itself is a made up number. Sleep tracking, at its best, functions less like a medical test that you pass or fail, and more as a way to see patterns over time.
How an Oura Ring calculates your sleep score
85–100: Optimal. An 85 or higher means all your metrics appear reasonably healthy. Oura even marks the day with a crown icon in the app.
Under 70: Pay Attention. Scores below 70 indicate that you may benefit from prioritizing rest and recovery.
Oura has been shown to be the most accurate of all the wearables on this list, largely because it reads from your finger, which provides stronger optical signal than a wrist.
Whoop gives you two numbers—a Sleep Performance percentage and a Recovery score—and it expects you to read them together.
Recovery is the broader daily readiness score, also expressed as a percentage, and this is the number most Whoop users check first. Recovery is color-coded into three zones: Green (67–100%) means you're well recovered and primed to perform; Yellow (34–66%) means your body is maintaining and ready for moderate strain; Red (0–33%) signals that rest is likely what your body needs.
Whoop also stands out for avoiding a single "sleep was good/bad" verdict. The sleep performance percentage tells you about quantity and consistency relative to your personal need, while the Recovery score tells you how your body responded. Most people consider Whoop and Oura to be neck-and-neck for the top sleep trackers.
How a Garmin calculates your sleep score
90–100: Excellent
60–79: Fair
For Garmin, the nightly sleep score is calculated based on a blend 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." What that last point should mean is Garmin tracks the change in time between heartbeats during sleep, and factors that in when scoring your overall sleep quality. In theory, this should account for something like your nervous system staying elevated all night, even if you were physically still.
Garmin (along with the rest of the smartwatches below) is probably best considered as a smartwatch that happens to track sleep, as opposed to a dedicated sleep tracker, like Oura or Whoop.
Your score is calculated based on sleep duration (worth 50 points), bedtime consistency (worth 30 points), and interruptions—how often you wake up and how long you stay awake (worth 20 points). The current five-tier scale, as updated in watchOS 26.2, looks like this:
81–95: High
41–60: Low
Compared to the other trackers on this list, Apple's score seems to focus on habits around sleep (enough hours, consistent timing, minimal waking) rather than trying to take a stab at sleep stages.
How a Fitbit calculates your sleep score
The four ranges:
80–89: Good
Below 60: Poor
One catch: To see a detailed breakdown of your restoration score, you need a Fitbit Premium subscription. Basic users see the total score, but the granular component breakdown is paywalled.
Oura: Good sleep, adequately rested.
Apple Watch: Just above midpoint of the "OK" tier.
WHOOP: Not directly comparable, since it's percentage-based).
The bottom line
Again, the more useful way to read these scores is as a trend signal over time, not a verdict on any single night. To get the most out of your sleep scores, I explain the best practices for sleep tracking here.
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