Oura Cardio Effort is a new score that shows how hard a workout really was on your heart, not just how long it lasted. Oura announced it on October 20, 2026, alongside an automatic VO2 max estimate.
If you wear a Gen3 or newer ring, you can get a clearer answer to “am I training enough, or too much?” without buying a new device.
Quick Facts
- Announced on October 20, 2026.
- Two features: Cardio Effort and automatic VO2 max.
- Works with Oura Ring Gen3 and later, per TechCrunch.
- VO2 max is launching inside Oura Labs, the experimental-features area.
- Oura hasn’t said whether a membership is required.
That last point matters if you don’t pay for Oura’s subscription. Check the app before you count on either feature.
What Oura Cardio Effort Actually Measures
Most trackers tell you minutes and heart rate zones. Oura Cardio Effort goes a step further and combines intensity with duration, so a short, hard session can score like a longer, easier one.
It compares your heart rate with your long-term resting heart rate, not a guessed maximum heart rate. That’s a more personal baseline, since max heart rate formulas are often off by a lot.
According to The 5K Runner, the score is based on Training Impulse (TRIMP), a long-used method for estimating cardiovascular load. It counts live-tracked workouts, confirmed auto-detected sessions, and manual entries, so strength, cycling, and yoga count too.
The Weekly Score: Five Levels
Besides scoring each workout, Oura adds up your week and drops it into one of five levels. The ranges are personal to you and use a rolling six-week window, and they appear after two weeks of wear.
| Level | What it tells you |
|---|---|
| Light | You moved less than your usual range |
| Fair | A bit below your normal load |
| Maintaining | You are holding your current fitness |
| Building | You are pushing enough to improve |
| Reaching | You are at the top of your personal range |
The goal is to shift the question from “how many minutes did I move?” to “am I maintaining, building, or overdoing it?” Oura also says Cardio Effort doesn’t directly set the next day’s Readiness Score.
Automatic VO2 Max Without the Lab Test
VO2 max is a standard measure of how well your body uses oxygen during exercise, and it’s a strong marker of long-term fitness. It used to need a lab test or at least a six-minute walking test.
Oura now estimates it passively from ordinary GPS-tracked walks, runs, and hikes. Your first estimate shows up after five qualifying workouts, and workouts without GPS don’t count.
You’ll see the number in ml/kg/min inside the My Health Heart Hub, plus a category: Low, Fair, High, or Peak. Alerts fire on meaningful changes, not daily wobble. It replaces the older Cardio Capacity metric.
How the Two Features Compare
The two metrics answer different questions. Cardio Effort is about what you did recently, while VO2 max is about where your fitness sits over months.
| Feature | What it shows | Where it lives |
|---|---|---|
| Cardio Effort | How hard a workout (or your week) was on your heart | Workout and weekly views in the Oura app |
| Automatic VO2 max | Long-term fitness estimate in ml/kg/min | My Health Heart Hub, via Oura Labs |
| Old Cardio Capacity | Earlier fitness estimate | Replaced by automatic VO2 max |
Because VO2 max launches in Oura Labs, expect it to change as Oura collects feedback. Treat early numbers as a trend line, not a medical result.
Who Should Care, and Who Can Skip It
Runners and hikers get the most from the VO2 max estimate, since it needs GPS workouts. People who lift weights or do yoga still benefit from Cardio Effort, because it scores those sessions too.
If you’re weighing wearables more broadly, our look at the Ray-Ban Meta glasses recording issue and the Apple HomeView price and release date cover two other gadgets worth checking.
Frequently Asked Questions
Which Oura rings get Cardio Effort?
TechCrunch says the new features are for Oura Ring Gen3 and later. Older rings aren’t mentioned.
Do I need a GPS workout for VO2 max?
Yes. Oura estimates it from GPS-enabled walks, runs, and hikes, and you need five qualifying workouts for the first number.
Does Cardio Effort change my Readiness Score?
Not directly, according to Oura. It’s a separate view of your training load.
Is a membership required?
Oura hasn’t made that clear in the coverage so far. Check the app or Oura’s site for current terms.
Overall, this is a sensible upgrade: the Oura Cardio Effort score fixes the “minutes only” problem, and passive VO2 max removes a hassle. I’d use the weekly level as a gentle guide, wait a few weeks before trusting the VO2 number, and avoid chasing “Reaching” every week.
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