Samsung Galaxy Watch VO2 Max: How It Works and How Accurate It Is
Run these workouts on your iPhone, or hands-free on Apple Watch. Get PEAKVO2 The Samsung Galaxy Watch estimates your VO2 max in Samsung Health using its BioActive sensor for wrist heart rate together with GPS pace and distance. It reads the value from an outdoor run or brisk walk of at least 10 minutes, analyzing how your heart responds as the workload rises. It is a wrist-based estimate, good enough to place you in a broad fitness category but not lab-precise, so trust the trend over the exact number, and remember the watch tracks your VO2 max, it does not train it.
Samsung has quietly made VO2 max a standard feature across the Galaxy Watch line. Here is exactly how it produces the number, what it needs from you, how far to trust it, how it compares to other watches, and what actually moves it. For what your score means at your age, see our VO2 max charts by age and sex.
Does the Samsung Galaxy Watch Measure VO2 Max?
The Galaxy Watch estimates it rather than measuring it directly. A true VO2 max reading needs a mask and a metabolic cart in a lab. What your watch does is model your maximal oxygen uptake from heart rate and pace data gathered during a workout, then extrapolate to your maximum. The result is an approximation that improves as you record more qualifying runs.
Where to Find VO2 Max on Samsung
Your VO2 max lives in the Samsung Health app, which pairs with every Galaxy Watch. The watch records the estimate during eligible workouts and syncs it to the app, where you see a current value and a trend over time. Because it needs an Android phone and Samsung Health, the Galaxy Watch is an Android-first device.
How Samsung Calculates VO2 Max
The Galaxy Watch reads VO2 max during exercise using two main inputs:
- The BioActive sensor, Samsung's multi-function optical heart rate sensor, tracks your heart rate through the workout. On current models this is a single chip that also handles ECG and body composition, but for VO2 max the optical heart rate signal is what matters.
- GPS pace and distance, which give the watch your external workload to compare against your heart rate.
The algorithm looks at how efficiently your heart delivers oxygen as the effort rises, combines that with your profile, age, sex, height, and weight, and estimates your maximum. One practical requirement drives it: the watch needs an outdoor run or brisk walk of at least 10 minutes with GPS to compute a VO2 max, because it needs enough of a pace-to-heart-rate sample to work from. Newer models such as the Galaxy Watch 7 use an upgraded BioActive sensor and refined algorithms that Samsung says improve accuracy over earlier watches.
How Accurate Is Samsung's VO2 Max?
Treat it as a broad guide. Samsung's wrist-based estimate does a reasonable job of placing you in the right fitness category, for example telling apart a fair reading around 30 to 35 ml/kg/min from an excellent one above 50. Where it is weaker is fine precision over time: small genuine changes can be hard to separate from noise. A few things affect the reading:
- The optical sensor is the limiting factor. Wrist heart rate struggles at high intensity, in cold weather, with tattoos, and with a loose fit, and the VO2 max is only as good as the heart rate feeding it.
- It needs qualifying outdoor workouts. Indoor treadmill runs without GPS, or walks under 10 minutes, do not feed the estimate.
- The absolute number is an estimate. As with any watch, the exact figure is less reliable than the direction it moves.
The takeaway is the same across all wearables: the trend is the signal. A steady climb over months of training is real; do not read too much into a two-point change between runs.
Samsung vs Garmin, Apple Watch, and Coros
Each brand estimates VO2 max its own way, which is why the numbers rarely match exactly across devices.
| Device | How it estimates VO2 max | Needs | Best for |
|---|---|---|---|
| Samsung Galaxy Watch | BioActive sensor heart rate plus GPS pace, in Samsung Health | A 10-minute outdoor run or brisk walk with GPS | Android users who want VO2 max built in |
| Garmin | Firstbeat analytics, from runs and power-based rides | Outdoor runs or cycling with power | Multisport athletes training by data |
| Apple Watch | Automatic from outdoor walks and runs (Cardio Fitness) | Outdoor GPS workouts | iPhone users who want passive tracking |
| Coros | EvoLab, from heart rate and pace on outdoor runs | A 25-minute outdoor run, one every 90 days | Runners who want a stable estimate |
For a fuller breakdown, see our best fitness trackers for VO2 max comparison.
How to Raise the VO2 Max Samsung Shows You
Here is the key point: the Galaxy Watch shows you the number, it does not train it. Watching the Samsung Health figure sit flat is frustrating without a plan to move it. VO2 max rises with high-intensity interval training, and the biggest gains come from time spent near your maximum heart rate (Helgerud et al., 2007). The reliable way to move it:
- Do two to three interval sessions a week. The Norwegian 4x4, four intervals of 4 minutes at 90 to 95 percent of max heart rate, is the most studied protocol.
- Build an easy aerobic base on the other days so the hard sessions are productive.
- Keep logging qualifying outdoor runs so Samsung Health has fresh data, and expect a measurable change after 6 to 8 weeks.
The training principle is the same on any device. If you train on iPhone or Apple Watch, PEAKVO2 guides the Norwegian 4x4, 30/30, and other VO2 max protocols with heart rate zones and automatic phases; on Android, run the same protocols with any interval timer that holds you to the right heart rate. Either way, follow the full 8-week VO2 max training plan to structure it.
Raise the number your watch shows you
PEAKVO2 runs the interval protocols that actually raise VO2 max, the Norwegian 4x4, Tabata, and 30/30, on iPhone and Apple Watch, with heart rate zones, spoken cues, and automatic phases. Three workouts free.
Get PEAKVO2 freeFrequently Asked Questions
Does the Samsung Galaxy Watch show VO2 max?
Yes. Every current Galaxy Watch estimates VO2 max and shows it in the Samsung Health app with a current value and a trend. The watch records it during a qualifying outdoor run or brisk walk, using the BioActive heart rate sensor and GPS.
How does the Galaxy Watch calculate VO2 max?
It uses the BioActive sensor for wrist heart rate and GPS for pace and distance, then analyzes how efficiently your heart delivers oxygen as the workload rises, combined with your age, sex, height, and weight, to estimate your maximum.
What do I need to do to get a VO2 max on Samsung?
Record an outdoor run or brisk walk of at least 10 minutes with GPS enabled. The watch needs that pace-to-heart-rate sample to compute a VO2 max; indoor workouts without GPS and very short walks do not qualify.
How accurate is Samsung Galaxy Watch VO2 max?
It is good for broad categorization, for example distinguishing a fair reading around 30 to 35 ml/kg/min from an excellent one above 50, but weaker at fine precision over time. The optical wrist sensor is the main limitation, so read the trend over weeks rather than the exact number.
Where do I see my VO2 max on the Galaxy Watch?
In the Samsung Health app on your paired Android phone, and on the watch itself after an eligible workout. If you do not see a value yet, record a 10-minute outdoor run or brisk walk with GPS and it will populate.
Can I improve the VO2 max Samsung shows me?
Yes. VO2 max is highly trainable. Two to three high-intensity interval sessions a week, such as the Norwegian 4x4, typically raise it by 5 to 15 percent in 8 to 12 weeks. Keep logging qualifying outdoor runs so Samsung Health updates, and the trend should climb.
Keep Reading
- Best Fitness Trackers for VO2 Max, Compared
- Garmin VO2 Max: How to Improve Your Estimate
- Coros VO2 Max: How EvoLab Estimates It and How Accurate It Is
- Polar VO2 Max: The Fitness Test, OwnIndex, and How Accurate It Is
- VO2 Max Training Plan: The Science of an 8-Week Program
References
- Samsung. Galaxy Watch and Samsung Health fitness metrics. Samsung Support. samsung.com
- Helgerud J, Høydal K, Wang E, et al. Aerobic high-intensity intervals improve VO2max more than moderate training. Med Sci Sports Exerc. 2007;39(4):665-671. PubMed
- Mandsager K, Harb S, Cremer P, et al. Association of cardiorespiratory fitness with long-term mortality. JAMA Netw Open. 2018;1(6):e183605. PubMed