{"id":451365,"date":"2026-02-01T09:43:24","date_gmt":"2026-02-01T09:43:24","guid":{"rendered":"https:\/\/www.newsbeep.com\/au\/451365\/"},"modified":"2026-02-01T09:43:24","modified_gmt":"2026-02-01T09:43:24","slug":"how-to-estimate-vo2-max-with-a-watch","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/au\/451365\/","title":{"rendered":"How to Estimate VO2 Max With a Watch"},"content":{"rendered":"

Your VO2 max score offers invaluable insights into your health and fitness. A 2018 cohort study<\/a> involving more than 120,000 participants found that the better your VO2 max<\/a>, the lower your risk of dying from things such as cancer, stroke, diabetes, and other common illnesses. And from a performance<\/a> perspective, understanding your VO2 allows you to fine-tune your programming and track your progress as you build endurance<\/a>. <\/p>\n

VO2 max, which measures how efficiently your body can take in and use oxygen to produce energy during intense exercise, is an undeniably powerful metric, whether you want to level up as an athlete or simply live a longer, healthier life. Heather Milton<\/a>, MS, RCEP, CSCS, an exercise physiologist and clinical specialist at NYU Langone\u2019s Sports Performance Center, says tracking your VO2 max over time is especially useful for determining if your training is working as well as setting workout intensities (think VO2 max pace, threshold pace<\/a>, and tempo pace). Yet, lab testing<\/a>, which is considered the gold-standard assessment, isn\u2019t widely accessible or cheap. (Services can range from $150 to $300 per test.) <\/p>\n

Related Story<\/p>\n

However, if you have a watch and a treadmill<\/a> (or a track where you measure the distance you cover), you can use a relatively simple testing protocol and math equation to estimate your VO2 max<\/a>. Your results will never be as accurate as what you\u2019d get with a lab test, which measures your inhaled oxygen and exhaled carbon dioxide while you run at a maximal effort, all under the watchful eye of a trained technician, but there are some things you can do to get the best information possible with the tools you have.<\/p>\n

How to Get the Most Accurate VO2 Max Estimate from Your Running Watch <\/p>\n

Most coaches and exercise physiologists tell you to take the VO2 max estimate generated by your running watch with a grain of salt. Research<\/a> indicates that those numbers, which are based on your age, biological sex, heart rate data, and physical activity, aren\u2019t totally accurate. In a 2025 study<\/a>, the Garmin fenix 6 got close with around a 7 percent margin of error. However, a separate study<\/a> conducted in the same year found that the Apple Watch\u2019s VO2 max estimate can be off by about 13 percent. <\/p>\n

However, the more data you feed your watch\u2019s algorithm, the more accurate your VO2 max estimate will be, says Joe Heikes, Garmin<\/a> product manager. He explains the watch (he works exclusively with Garmin products but assumes competitors employ comparable technology) anchors its initial calculation in stats like age, biological sex, estimated maximum heart rate, height, and weight. So be sure to fill out every field in your user profile. <\/p>\n

From there, the watch uses GPS to track your pace<\/a> while monitoring your heart rate response. It also takes into account environmental factors, including elevation, incline, and temperature<\/a>. \u201cWe\u2019re constantly adjusting your VO2 max based on a good chunk of recent data,\u201d Heikes says. \u201cThe more data, the better. The more runs you can do, the more we can dial in that number.\u201d <\/p>\n

Related Story<\/p>\n

Your runs don\u2019t have to be at VO2 max pace<\/a> (a nearly all-out effort you can sustain for 10 minutes, tops) to be useful. But, Heikes says, the occasional high-intensity run can help with accuracy. For example, the algorithm can use data from hard workouts to adjust your maximum heart rate<\/a> if the general estimate, which uses just your age, is off by a few points. <\/p>\n

Only outdoor runs<\/a> impact your VO2 max estimate, as the watch relies upon GPS technology. So a treadmill workout<\/a> won\u2019t be taken into account, even with the recorded time and distance. Heikes explains that the algorithm requires your real-time pace as it correlates to real-time heart rate and incline<\/a>.<\/p>\n

Here are a few more practical tips for generating the most accurate VO2 max estimate possible with your GPS devices:<\/p>\n

Wear your watch snugly on your wrist, and make sure it\u2019s in direct contact with your skin, not over your sleeve. If possible, use a chest strap. \u201cOur optical heart-rate sensors in the watches are fantastic, but it is true that the ECG-based technology in a heart-rate strap is better. It\u2019s going to be more accurate in some scenarios,\u201d Heikes says. In colder, drier weather, when it takes you longer to work up a sweat, wet the electrodes on your chest strap before putting it on. \u201cMoisture increases the conductivity between the skin and the heart rate monitor so that you get a better heart rate signal,\u201d Heikes says, noting that this is not the case for wrist sensors, which simply require being warmed up. Sync your watch with your phone at least once a day so that your main tracking app receives up-to-date information. Related StoryHow to Do Your Own VO2 Max Test with a Watch Timer<\/p>\n

If your watch doesn\u2019t have a VO2 max function, you can conduct your own test using a basic stopwatch and either a treadmill or a track. Research<\/a> shows that the Cooper 12-minute run test is about as accurate as the estimator on a running watch. Additionally, it can be a better option for people whose VO2 max scores are well above or below what\u2019s considered average for their age range.<\/a> <\/p>\n

Related Story<\/p>\n

\u201c[Watch estimators] typically work better for runners who are kind of in the middle range of VO2 max. For the outliers on the fast and slow ends, it doesn\u2019t perform as well,\u201d says Todd Buckingham, PhD, exercise physiologist at PTSportsPRO<\/a> in Grand Rapids, MI. <\/p>\n

To do the Cooper 12-Minute run test:Pick a day when you\u2019re well rested, hydrated, and not sore from a previous workout. Do a 5-minute warmup<\/a> before conducting the test. On a flat treadmill or track, following a short warmup, run as fast as you can for 12 minutes. \u201cThe best way to pace yourself is to run even splits<\/a>. It\u2019s most efficient that way. You\u2019re not starting too slow that you really have to kick it in and pick it up at the end. You also don\u2019t want to start too fast so that you burn out at the end,\u201d Buckingham says. He recommends aiming for something close to your 5K pace<\/a> and adjusting accordingly. Once you\u2019ve run for 12 minutes, stop and record your distance in miles. Use the below calculation to generate your VO2 max:<\/p>\n

VO2 max = (35.97 x your distance in miles) \u2013 11.29<\/p>\n

Alternatively, you can input your distance into an online calculator like this one<\/a>, which provides a score and a rating. You can also consult the following charts, which rank scores by age and sex. <\/p>\n

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