Not medical advice. This calculator does arithmetic on numbers you enter, for general education. It does not diagnose, treat, or recommend a dose or treatment for any condition, and it does not replace an evaluation by a licensed physician. A field estimate is not a cardiopulmonary exercise test. If you have a heart condition, chest pain, or dizziness with exertion, get medical clearance before any maximal-effort test. Talk to your own clinician before acting on any result.
VO2 max, the most oxygen your body can use during all-out exercise, can be estimated at home from a resting heart rate, a 12-minute run, or a timed 1-mile walk. Each method below uses a published equation, and each one gives a number in mL/kg/min that you can retest every few months to follow your fitness.
Cardiorespiratory fitness is one of the strongest measured predictors of long-term survival, with higher fitness linked to lower mortality across every level studied.1,2 A home estimate gives you a starting point to build from.
VO2 Max Calculator
Pick a method. The resting heart rate method needs no exercise. The run and walk tests need a measured course and a stopwatch.
Estimated VO2 max
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In METs
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Field equations estimate VO2 max with an error of several mL/kg/min against a laboratory test. Use one method consistently and compare each result with your own earlier ones. Enter walk time in decimal minutes: 15 minutes 30 seconds is 15.5.
Three Ways to Estimate VO2 Max at Home
Resting Heart Rate Ratio
Uth and colleagues showed that VO2 max can be estimated as 15.3 multiplied by the ratio of maximum to resting heart rate, in a study of well-trained men.3 Take your resting heart rate lying down, first thing in the morning, on three mornings and use the average. If you have not measured your maximum heart rate in a hard effort, the calculator estimates it as 208 minus 0.7 times your age, the Tanaka equation.4
Cooper 12-Minute Run
Run as far as you can in 12 minutes on a flat, measured course such as a 400 m track, and enter the distance. Cooper published the equation in 1968 from Air Force personnel whose treadmill VO2 max was measured in the laboratory.5 It suits people who already run regularly, because a pacing mistake in the first few minutes lowers the result.
Rockport 1-Mile Walk
Walk 1 mile as fast as you can without running, then note your time and your heart rate at the finish. Kline and colleagues built the equation from adults aged 30 to 69, and it adds weight, age, and sex to the time and heart rate.6 It is the gentler of the two exercise tests and suits anyone starting out.
How Close a Field Estimate Gets
The reference measurement is a cardiopulmonary exercise test, in which you exercise to exhaustion while a mask measures the oxygen you use. Field equations estimate that figure from heart rate or performance, so a single result can sit several mL/kg/min away from a laboratory value. The heart rate method was developed in well-trained men, and that study did not test its accuracy in other groups.3
Pick one method, test under the same conditions, and compare each new result with your own earlier ones. A rise that holds across repeat tests with the same method points to a real change in fitness.
VO2 Max and Long-Term Health
In a meta-analysis of 33 studies, Kodama and colleagues found that each 1-MET increase in cardiorespiratory fitness was associated with a 13 percent lower risk of death from any cause.1 A later study of more than 120,000 adults who completed treadmill testing at the Cleveland Clinic found lower long-term mortality at every step up in fitness, with no upper level at which the association stopped.2
The calculator shows your result in METs as well as mL/kg/min for that reason, since 1 MET equals 3.5 mL/kg/min. Fitness falls with age in every reference dataset, and the published standards from the FRIEND registry give laboratory-measured values by age and sex for comparison.7
Raising Your VO2 Max
Both continuous endurance training and high-intensity interval training raise VO2 max, and a meta-analysis of controlled trials found larger gains with intervals.8 A practical week combines two or three longer sessions at a conversational pace with one interval session, built up over several weeks. Retest every 8 to 12 weeks with the same method to see whether the plan is working.
Endurance work raises VO2 max, and strength training protects muscle mass as you age. Our guide to the benefits of strength training covers the muscle side, and low-impact exercises offers options when joints limit running. The body fat percentage calculator tracks the composition side of the same plan.
The Opt Take on VO2 Max
VO2 max is one of the clearest numbers you can move with training, and it is most useful as part of a longevity plan that also tracks your labs. Exercise is one of the six pillars of the Opt Health care model, alongside sleep, stress, hormones, inflammation, and nutrition. The Opt app connects Apple Watch, Garmin, and Fitbit data, so your fitness trend sits beside your other measurements.
The Opt Performance Score updates bi-weekly from wearables, check-ins, and quarterly labs. The Longevity membership adds 65+ biomarkers and epigenetic testing for biological age, with a 90-minute physician consultation to build the plan.
Get started: Begin with Opt Health, where a physician reads your labs, builds your plan, and adjusts it over the loop.
Frequently Asked Questions
VO2 max is compared by age and sex, because it falls with age in every reference dataset. The FRIEND registry publishes laboratory-measured standards by decade. For tracking your own fitness, the most useful comparison is your result against your own earlier tests with the same method.
Divide your maximum heart rate by your resting heart rate and multiply by 15.3. With a maximum of 177 and a resting rate of 60, the estimate is about 45 mL/kg/min. If you do not know your maximum heart rate, 208 minus 0.7 times your age gives an estimate.
Smartwatches estimate VO2 max from heart rate and pace during walks or runs, which puts them in the same family as the field tests on this page. Their readings are most useful for following a trend on one device, rather than for comparison with a laboratory value.
The controlled trials pooled by Milanović and colleagues in 2015 reported VO2 max gains from endurance and interval programs lasting several weeks. Retest every 8 to 12 weeks with the same method to see your own progress.
A MET is a unit of energy use equal to 3.5 mL of oxygen per kilogram of body weight per minute, roughly the rate at rest. A VO2 max of 42 mL/kg/min equals 12 METs.
A rising VO2 max is one sign a longevity plan is working, and labs show the rest. An Opt Health membership pairs your wearable data with a physician who reviews your panel at each follow-up, 2 to 4 times a year depending on plan.
References
- Kodama S, Saito K, Tanaka S, et al. Cardiorespiratory fitness as a quantitative predictor of all-cause mortality and cardiovascular events in healthy men and women: a meta-analysis. JAMA. 2009;301(19):2024-2035.
- Mandsager K, Harb S, Cremer P, et al. Association of cardiorespiratory fitness with long-term mortality among adults undergoing exercise treadmill testing. JAMA Netw Open. 2018;1(6):e183605.
- Uth N, Sørensen H, Overgaard K, Pedersen PK. Estimation of VO2max from the ratio between HRmax and HRrest: the Heart Rate Ratio Method. Eur J Appl Physiol. 2004;91(1):111-115.
- Tanaka H, Monahan KD, Seals DR. Age-predicted maximal heart rate revisited. J Am Coll Cardiol. 2001;37(1):153-156.
- Cooper KH. A means of assessing maximal oxygen intake: correlation between field and treadmill testing. JAMA. 1968;203(3):201-204.
- Kline GM, Porcari JP, Hintermeister R, et al. Estimation of VO2max from a one-mile track walk, gender, age, and body weight. Med Sci Sports Exerc. 1987;19(3):253-259.
- Kaminsky LA, Arena R, Myers J. Reference standards for cardiorespiratory fitness measured with cardiopulmonary exercise testing: data from the Fitness Registry and the Importance of Exercise National Database. Mayo Clin Proc. 2015;90(11):1515-1523.
- Milanović Z, Sporiš G, Weston M. Effectiveness of high-intensity interval training (HIT) and continuous endurance training for VO2max improvements: a systematic review and meta-analysis of controlled trials. Sports Med. 2015;45(10):1469-1481.
This content is for informational purposes and does not replace evaluation, diagnosis, or treatment by a qualified medical professional.
This article is part of our guide to longevity. See how longevity medicine works at Opt Health.
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