VO2 Max Estimate: What It Means for Your Fitness | WHOOP

VO2 Max is one of the most powerful indicators of your cardiovascular fitness and long-term health. It measures the maximum amount of oxygen your body can use during intense physical activity—a direct reflection of how efficiently your heart, lungs, and muscles work together. Whether you're focused on optimizing performance or extending your healthspan, understanding your VO2 Max gives you a clear, actionable metric to guide your training and lifestyle decisions. WHOOP now estimates your VO2 Max using a proprietary algorithm validated against clinical testing, providing weekly updates and long-term trends so you can monitor your progress without ever stepping into a lab.

What is VO₂ max?

VO₂ max is the maximum amount of oxygen your body can use during intense physical activity. It measures how efficiently your heart and lungs can deliver oxygen to your muscles, and how well your muscles can extract and use that oxygen to generate energy. Think of it as the size of your engine—the higher your VO₂ max, the more oxygen your body can consume, which translates to better cardiovascular fitness and endurance. While it is a popular metric for endurance athletes, it is also one of the strongest indicators of your overall health and longevity.

Why VO₂ max matters

The importance of VO2 Max is applicable to everyone—from those prioritizing health and longevity to performance-focused athletes. Understanding your VO2 Max is essential for anyone who is interested in understanding and improving their health. [As we age, our VO2 Max naturally decreases](https://pmc.ncbi.nlm.nih.gov/articles/PMC4968829/#:~:text=Maximal%20oxygen%20consumption%20(VO2,8%2C%209%2C%2010%5D.), which can lead to a decrease in endurance and overall fitness. Investing in your VO₂ Max today helps preserve your ability to stay active and enjoy the activities you love as you age, making daily life easier and more fulfilling in the future. By monitoring your trends, you can take steps to improve it over time.

What is a good VO₂ max estimate by age and sex?

Your VO₂ max naturally changes as you age, and it varies between men and women due to physiological differences like muscle mass and body composition. For most people, an average VO₂ max falls between 35 and 40 mL/kg/min. Scores above 50 mL/kg/min generally indicate excellent cardiovascular fitness. Because cardiovascular function naturally declines over time, a good score for someone in their 20s will look different than a good score for someone in their 50s. Men typically have slightly higher baseline values than women. Understanding where you stand relative to your age and sex helps you set realistic, personalized goals for your healthspan.

How WHOOP estimates your VO₂ max

WHOOP estimates VO2 Max through a three-tier proprietary algorithm that incorporates a passive model, a GPS-augmented model, and a calibrated estimate. These include physiological metrics, activity data, and demographic information. The result is a highly personalized estimate that is tailored to your unique physiology and lifestyle. WHOOP estimates your VO2 Max by combining thousands of data points when you're active, and while you're at rest. Every week, you get an updated VO2 Max estimate with trend views to see how you're progressing and where you stand relative to other people like you.

WHOOP has developed this algorithm through extensive data collection at WHOOP Labs. By using a using a metabolic cart device that measures the rate of gas exchange in your breathing during maximal exercise testing, WHOOP has been able to collect a large amount of data to train and validate the algorithm alongside WHOOP recovery metrics, HR training zone time, and GPS-enabled running data collected via WHOOP. WHOOP VO2 Max meets stringent accuracy requirements, with estimates tracking within 3.3 to 3.7 mL/kg/min of a lab-measured value.

Where to find your VO₂ max estimate in the WHOOP app

Your VO₂ Max estimate can be added to your home screen by tapping "Customize" next to "My Dashboard". VO2 Max is a slow moving metric that reflects changes in your fitness level and overall health, therefore, it updates weekly on Tuesdays. Members with a lab-tested VO₂ Max score can also manually enter their scores from the Trends screen by tapping "Add manual measurement". Be sure to use the date that you completed the assessment to ensure the WHOOP VO2 Max algorithm properly incorporates your lab measurement into its future calculations.

To be eligible for a VO2 Max estimate, you must have at least 14 recoveries within the last 21 days. For members with fewer than 14 recoveries within the last 21 days, the VO2 Max Trend view will show how many recoveries are left until it's available.

Go deeper into your VO₂ Max Trends by tapping the data description to discuss with WHOOP Coach. Plus, see where your score ranks against people like you based on your age and sex. Go into advanced mode: make your VO₂ Max estimate more precise by logging a short run or updating your weight. Log a 15+ min GPS-tracked run by ensuring "track route" is toggled on after you tap "Start Activity" and follow the prompts. Log your weight by tapping "+ Update Weight" in the VO₂ Max Trend view or following the directions here based on manual or automated entry.

How to increase your VO₂ max

Elevating your VO2 Max is a key strategy for improving your long-term cardiovascular health and overall fitness. One of the most effective ways to increase your VO2 Max is to engage in regular cardiovascular exercise, such as running, cycling, and swimming. These activities help your body become more efficient at taking in and using oxygen.

Weight management is also key to optimizing your VO2 Max. Carrying excess weight can make it harder for your body to use oxygen efficiently, as it puts added stress on your heart and lungs. By maintaining your weight through a balanced diet and regular exercise, you can help reduce the load on your cardiovascular system, which can help improve your VO2 Max and overall heart health. The WHOOP VO₂ Max estimate will also be more precise when a member keeps their weight up to date for this reason.

Adequate sleep and stress management are often overlooked but are crucial components in maximizing your VO2 Max. Sleep deprivation and chronic stress can negatively impact your body's ability to recover and perform optimally. Ensuring that you get enough restful sleep allows your body to repair and rejuvenate, which is essential for maintaining high levels of VO2 Max.

Regularly monitoring your VO2 Max can help you make informed decisions about your training and lifestyle. Whether you are looking to improve your long-term cardiovascular health or are an athlete aiming for peak performance, understanding your VO2 Max can provide valuable insights and motivation for continuous improvement.

Frequently asked questions about VO₂ max estimates

How accurate are VO₂ max estimates from wearables?

Wearable estimates have become highly sophisticated. WHOOP estimates your VO₂ max using a proprietary algorithm validated against clinical metabolic cart tests. By analyzing your heart rate, activity data, and resting metrics, WHOOP provides a reliable estimate that tracks closely with lab-measured values, allowing you to monitor your trends without visiting a clinic.

How can I check my VO₂ max at home?

You can check your VO₂ max at home using a continuous health monitor like WHOOP. Instead of performing a grueling maximum-effort test, WHOOP calculates your estimate in the background by analyzing your daily strain, heart rate zones, and recovery data. You can view your updated estimate and long-term trends directly in the WHOOP app.

How long does it take to improve my VO₂ max?

VO₂ max is a slow-moving metric. While you might notice improvements in how you feel during workouts within a few weeks, measurable changes in your VO₂ max estimate typically take several months of consistent cardiovascular training. Focus on maintaining a regular routine of aerobic exercise and adequate recovery to see long-term progress.