Amazfit VO2max: how it works.
Uses your profile plus heart rate and speed (and elevation) from outdoor runs. Amazfit says it estimates best on flat runs at low altitude.
What counts towards your VO2max
Estimated from: Outdoor run. Not used: Walk, Treadmill, Bike (power meter), Resting test, All-day data.
What you need to do
Correct profile in the Zepp app, then an outdoor, trail or track run of at least 10 minutes with heart rate reaching 75% of max HR.
How it is shown
Shown in the watch's Workout Status app and in workout records, mapped to seven levels (Novice, Elementary, Ordinary, Medium, Good, Excellent, Superior); history and trend in the Zepp app.
Related features
- Fitness age: not confirmed
- Race predictor: yes
- Training Load
- Training Effect (aerobic/anaerobic)
- Recovery Time
- Training Stress Balance
- Lactate threshold
- Real-time Performance
- Achievement Prediction (race times)
- BioCharge
Models
Balance 3 · Cheetah 2 Pro · Cheetah 2 Ultra · T-Rex 3 Pro · Active 3 Premium · Bip Max
How accurate is it?
We found no published, peer-reviewed validation of this estimate. Watch estimates in general are reasonable for groups but can be several points off for individuals — see how accurate watch VO2max is.
Product pages say VO₂ Max works only in Outdoor Running, Trail Running and Track Run modes. 2026 firmware notes for Balance 3, Cheetah 2 Pro and T-Rex 3 Pro say the VO₂ Max algorithm was tuned for accuracy and stability. Active Max, T-Rex 3 and the Helio Strap also support it (the strap during outdoor runs of 10+ min). Achievement Prediction needs at least one 3K run. No subscription is mentioned for this feature. Older Amazfit watches are reported to have used Firstbeat; no official source found.
Frequently asked questions
How does Amazfit calculate VO2max?
Uses your profile plus heart rate and speed (and elevation) from outdoor runs. Amazfit says it estimates best on flat runs at low altitude. Correct profile in the Zepp app, then an outdoor, trail or track run of at least 10 minutes with heart rate reaching 75% of max HR.
How accurate is Amazfit VO2max?
We found no published, peer-reviewed validation study of the Amazfit estimate. Treat it as a trend tracker rather than a lab value.
Which Amazfit devices show VO2max?
Examples: Balance 3, Cheetah 2 Pro, Cheetah 2 Ultra, T-Rex 3 Pro, Active 3 Premium, Bip Max. Support depends on model and firmware.
Check your number against the norms for your age, estimate it with the VO2max calculator, or turn it into race times and paces.
Sources
- Amazfit Active Max support: Workout Status (VO₂ Max)
- Amazfit Running Technology page (VO₂ Max, Achievement Prediction, Training Load)
- Zepp Health Technology page (PeakBeats)
- Amazfit T-Rex 3 user manual (PDF)
- Amazfit Bip Max product page (VO₂ Max modes footnote)
- Amazfit Balance 3 product page
- Amazfit FAQ: VO2 Max on the Helio Strap
Amazfit is a trademark of its owner. VO2max Health is independent and not affiliated with Amazfit. Features vary by model and firmware.