Amazfit VO2 Max: How Zepp Estimates It and How Accurate It Is
Run these workouts on your iPhone, or hands-free on Apple Watch. Get PEAKVO2 Amazfit watches estimate your VO2 max through Zepp, the app and algorithm platform behind every Amazfit device. It models your maximal oxygen uptake mainly from your outdoor GPS runs and wrist heart rate, blended with passive signals like resting heart rate and overnight heart rate variability and your profile. It is a running-based estimate on budget hardware, and independent tests have found it broadly in line with a Garmin, so trust the trend over the exact number, and remember Amazfit tracks your VO2 max, it does not train it.
Amazfit has made VO2 max tracking, once a premium-watch feature, available at a fraction of the price. Here is exactly how the Zepp algorithm produces the number, what it needs from you, how far to trust it on lower-cost sensors, 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 Amazfit Measure VO2 Max?
Amazfit estimates it rather than measuring it directly. A true VO2 max reading needs a mask and a metabolic cart in a lab. What your Amazfit watch does is model your maximal oxygen uptake from the data it can gather, using proprietary algorithms developed by Zepp, the software platform that powers Amazfit. The result is an approximation that improves as you record more runs.
Where to Find VO2 Max on Amazfit
Your VO2 max lives in the Zepp app, which every Amazfit watch pairs with, alongside related training metrics like training load, training effect, and recovery on the models that support them. The watch shows a current value and a trend over time, so you can watch the number respond to your training.
How Amazfit Calculates VO2 Max
Zepp's algorithm fuses several inputs rather than relying on one. It draws on:
- Outdoor GPS runs, the main signal: your pace and elevation from GPS paired with your wrist heart rate, so the algorithm can compare external output to internal effort.
- Wrist heart rate from the optical sensor on the back of the watch.
- Passive biometrics, including resting heart rate and overnight heart rate variability trends.
- Your profile, meaning age, sex, height, weight, and self-reported activity level.
From these it models how efficiently your cardiovascular system responds to submaximal effort and extrapolates your maximum. Because the strongest signal comes from running, an Amazfit VO2 max is most meaningful once you have logged outdoor runs; worn without them, it leans on the weaker passive and profile estimate.
How Accurate Is Amazfit's VO2 Max?
Treat it as a ballpark, and a surprisingly decent one for the price. In independent testing, Amazfit VO2 max estimates have come out broadly in line with a Garmin watch paired with a heart rate monitor, which is a good result for budget hardware. But two honest caveats apply:
- The optical heart rate sensor is the limiting factor. Lower-cost wrist sensors struggle more with high intensities, cold weather, tattoos, and loose fit, and the VO2 max estimate is only as good as the heart rate feeding it. A chest strap paired to the watch improves the input.
- It is a longitudinal tool, not a diagnostic one. Consumer VO2 max estimates are feedback loops whose value is in detecting shifts over time, not in absolute precision. Beginners especially should read the figure as guidance.
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.
Amazfit 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 |
|---|---|---|---|
| Amazfit | Zepp algorithm, from GPS runs and wrist heart rate plus passive signals | Outdoor GPS runs | Budget-minded runners who want the metric affordably |
| 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 | Passive tracking with no test |
| 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 Amazfit Shows You
Here is the key point: Amazfit shows you the number, it does not train it. Watching the Zepp 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 outdoor runs so Zepp has fresh data, and expect a measurable change after 6 to 8 weeks.
Amazfit tracks the trend; a training app runs the sessions that create it. PEAKVO2 guides the Norwegian 4x4, 30/30, and other VO2 max protocols on iPhone and Apple Watch with heart rate zones and automatic phases, then you watch your Amazfit number climb. Follow the full 8-week VO2 max training plan to structure it.
Raise the number Amazfit 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 Amazfit show VO2 max?
Yes. Amazfit watches estimate VO2 max through the Zepp app and algorithm, and show it with a current value and a trend, alongside training metrics like load and recovery on supported models. You get the most meaningful estimate once you record outdoor GPS runs.
How does Amazfit calculate VO2 max?
Zepp's algorithm combines your outdoor GPS runs, pace and elevation with your wrist heart rate, plus passive signals like resting heart rate and overnight heart rate variability and your profile, then models how efficiently your body responds to effort and extrapolates your maximum. Running is the main input.
Is Amazfit VO2 max accurate?
For budget hardware it is reasonable. Independent tests have found Amazfit VO2 max broadly in line with a Garmin paired with a heart rate monitor. The optical wrist sensor is the main limitation, so a chest strap improves it, and the estimate is best read as a trend over time rather than an exact number.
Do I need to run outdoors for Amazfit VO2 max?
Outdoor GPS runs give the best estimate, because they let the algorithm pair pace with heart rate. Without runs, Amazfit leans on passive signals and your profile, which is a weaker estimate. Log a few outdoor runs to get a meaningful VO2 max.
Is Amazfit or Garmin better for VO2 max?
Garmin's Firstbeat estimate has stronger independent validation and covers cycling with a power meter, while Amazfit delivers a broadly comparable running estimate for much less money. Neither trains the number, so for improving VO2 max, pair whichever you own with an interval program.
Can I improve the VO2 max Amazfit 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 outdoor runs so Zepp 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
- Samsung Galaxy Watch VO2 Max: How It Works and How Accurate It Is
- VO2 Max Training Plan: The Science of an 8-Week Program
References
- Amazfit / Zepp. VO2 max and training metrics. Zepp app documentation. amazfit.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