# does apple watch have vo2 max — Wearable Metrics Explained > Updated: 2026-05-19 · Source: https://dorsi.ai/topics/does-apple-watch-have-vo2-max Does the Apple Watch measure VO2 max? Yes — since watchOS 5, it provides an estimate called Cardio Fitness. One study found Apple Watch's VO2 max… Your Apple Watch has been estimating VO2 max since the Series 3 hit the market in 2017. It pulls heart rate and GPS data from your outdoor walks or runs, then spits out a 'Cardio Fitness' level in the Health app—measured in mL/kg/min. Those numbers naturally drop as you age or sit around more, but consistent training can push them back up. On this page, I'll break down what your score actually means and how Dorsi can help you raise it safely. Does the Apple Watch measure VO2 max? Yep — since watchOS 5, it's been handing you an estimate called Cardio Fitness. One study found Apple Watch readings deviate by just 0.7 mL/kg/min on average from lab measurements. That’s impressively close. Another showed every 1 MET increase in fitness lowers mortality risk by 12%. Still, 45% of users never even glance at this data. A 2022 study linked VO2 max under 30 mL/kg/min to a 2.1x higher risk of heart disease. The blog "Three Apple Watch Numbers That Should Change How You Train" breaks down which metrics actually deserve your attention. Dorsi, an adaptive AI coach, turns these wearable signals into strength workouts that actually make sense. Let’s start with how your watch measures it, then we'll dig into where it falls short, and finally, I'll share some tips to push your numbers higher. While it can help you track changes in your fitness over time, it shouldn't replace a doctor's advice. ## Check your Apple Watch for VO2 max data Open the Fitness app on your iPhone, tap the Show More button next to Cardio Fitness. You'll see an estimated VO2 max reading. Apple Watch gathers this during outdoor walks, runs, or hikes. If you haven't recorded such workouts, you won't have a number yet. That's normal—just start moving. ## How accurate is Apple Watch's VO2 max estimate? Apple Watch estimates VO2 max using heart rate and GPS data. Studies show it's within 10% of lab measurements for steady-state exercise. But it struggles with interval training or hot days. For most casual runners, it's reliable enough. I'd trust the trend over the absolute number. ## How to improve your VO2 max score over time High-intensity intervals push your VO2 max up faster than steady jogs. Try 4-minute repeats at a pace you can barely sustain for 8 minutes. Rest half that time. Do this twice a week. Consistent speed work raises your ceiling. After 6 weeks, expect a 3-5% bump. ## When to rely on watch-based VO2 max vs lab tests Apple Watch gives you a ballpark—useful for tracking month-to-month changes. If you're targeting elite performance or managing a heart condition, get a proper metabolic test. Lab results are exact. Don't overthink the daily noise; focus on whether the number trends up or down. ## FAQ ### How do I get my Apple Watch to measure VO2 max? Open the Health app on your iPhone and tap Browse > Heart > Cardio Fitness. Make sure your watch is paired and your personal info—age, weight, height—is correct. Then go for an outdoor walk, run, or hike for at least 20 minutes. The feature works on Apple Watch SE, Series 3, or later running watchOS 7.2+. Your first reading might take a few workouts to show up. ### Is 27 VO2 good? A VO2 max of 27 is considered low. For a 40-year-old man, the average is around 40; for a woman of the same age, it's 35. 27 puts you in the 20th percentile or lower, meaning you'd benefit from more consistent cardio—brisk walking or interval jogs. That said, if you're over 70 or have a health condition, it might be normal. Better to compare against your own age and sex. ### Can Apple Watch accurately measure VO2 max? It's good enough for tracking trends, but not for a clinical diagnosis. Apple’s algorithm estimates VO2 max using heart rate and GPS data during outdoor walks or runs—steady-state workouts work best. Studies show around 5-10% error compared to lab tests. For everyday fitness tracking, that’s fine. If you need precision, get a proper metabolic cart test. ### Is 47 a good VO2 max score? Absolutely. For a 30-year-old man, 47 is above average (average is about 44). For a 50-year-old woman, 47 would be excellent—top 10-15% of her age group. It suggests you have solid cardiovascular fitness. Runners often score 40-50. If you got that from your Apple Watch, keep up whatever routine you’re doing—it’s working.