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VO2max Calculator

Estimate your aerobic fitness without a lab test. Based on the NTNU non-exercise model, built on 4260 healthy Norwegian adults.

VO2max, maximal oxygen uptake, is the gold standard measure of aerobic fitness. This calculator uses the NTNU non-exercise prediction model developed from The HUNT Fitness Study in Norway. No treadmill, no lab, no wearable required, just your age, resting heart rate, waist measurement, and activity level.

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For reference only. The published standard error is 5.7 ml/kg/min for men and 5.14 for women, so read the result as a band, not a number. For precise measurement use a lab VO2max test. This tool is not a medical device.

Sex selects one of two separate HUNT equations. It also selects the percentile bands, which are a separate fitness norm classification and not part of the HUNT study

Measure after 10 min seated rest, ideally on waking

Measure at navel level, standing, end of normal exhale

Men: VO2max = 100.27 - (0.296 × age) + (0.226 × PA) - (0.369 × WC) - (0.155 × RHR) Women: VO2max = 74.736 - (0.247 × age) + (0.198 × PA) - (0.259 × WC) - (0.114 × RHR)

VO2MAX (ml/kg/min)

50.9

Above average

Men, age 30 to 39 · average 39 to 47 ml/kg/min

VO2max norms: Men, age 30 to 39

CategoryRange (ml/kg/min)
Superior > 56
Excellent 51 to 56
Above average ← you47 to 50
Average 39 to 46
Below average 35 to 38
Poor < 35

VO2max norms by age: Men

AgePoorBelow avgAverageAbove avgExcellentSuperior
20 to 29<3838 to 4243 to 4950 to 5455 to 60>60
30 to 39 ←<3535 to 3839 to 4647 to 5051 to 56>56
40 to 49<3232 to 3536 to 4243 to 4748 to 53>53
50 to 59<2828 to 3132 to 3738 to 4142 to 48>48
60+<2424 to 2829 to 3435 to 4041 to 46>46
Also useful: Check your morning HRV readiness → · Calculate training load (ACWR) →

Nes BM, Janszky I, Wisløff U, Støylen A, Karlsen T. (2011). Scandinavian Journal of Medicine & Science in Sports. NTNU CERG Fitness Study, Norway.

VO2max explained

Maximal oxygen uptake explained

VO2max is the maximum volume of oxygen your body can extract from the air and deliver to working muscles per minute, expressed per kilogram of bodyweight (ml/kg/min). It reflects the combined capacity of your lungs, heart, blood, and muscles to transport and use oxygen during exhaustive exercise.

Why VO2max matters

  • Endurance performance: VO2max sets the ceiling on aerobic capacity, the higher it is, the faster you can sustain effort over distance.
  • Health marker: Low VO2max predicts cardiovascular disease risk and all-cause mortality more reliably than most other biomarkers.
  • Aging: VO2max declines approximately 1% per year after age 25. Regular training slows this decline significantly.

VO2max vs. fitness age

Maintaining a VO2max above average for your age group is associated with better cognitive function, lower diabetes risk, and greater longevity. That last one is measurable: Kodama et al. (2009), a meta-analysis in JAMA, found that each 1 MET of higher fitness, about 3.5 ml/kg/min, went with a relative risk of 0.85 for cardiovascular events and 0.87 for all cause mortality, so roughly 15 and 13 percent lower. That is Kodama's finding, not HUNT's: HUNT built the estimate this page uses and did not measure mortality.

VO2max is genetic in part, elite endurance athletes inherit exceptional cardiac output and oxygen-carrying capacity. However, training can improve it by 15 to 20% even in untrained adults.

Frequently asked questions

What is VO2max and why is it important?

VO2max is the maximum rate at which your body can consume oxygen during exhaustive exercise, measured in ml of oxygen per kg of bodyweight per minute (ml/kg/min). It is the single best predictor of endurance performance and a strong independent predictor of cardiovascular health and longevity. Higher VO2max is associated with reduced risk of heart disease, type 2 diabetes, and all-cause mortality.

How accurate is this VO2max estimate?

The NTNU non-exercise model has a published standard error of the estimate of 5.7 ml/kg/min for men and 5.14 for women, and explains 61 and 56 percent of the variance respectively. This means the estimate gives you a reasonable range, within about half a fitness category. For population-level screening and tracking changes over time, it is valid and useful. For precise measurement (e.g. for sports science, clinical research, or competitive athlete testing), a laboratory VO2max test with gas analysis is required.

What is a good VO2max for my age?

VO2max norms vary significantly by age and sex. For men aged 30 to 39, average is 40 to 47 ml/kg/min; excellent is 52 to 56. For women aged 30 to 39, average is 33 to 39 ml/kg/min; excellent is 44 to 49. These thresholds shift down approximately 3 to 4 ml/kg/min per decade with age. Recreational runners typically score above average; competitive endurance athletes score excellent or superior.

How do I measure resting heart rate correctly?

Measure resting heart rate first thing in the morning before getting out of bed. Lie still for a few minutes after waking, then count your heartbeats for a full 60 seconds (or 15 seconds × 4). For accuracy, measure on three consecutive mornings and average the results. A chest strap or optical heart rate monitor worn overnight provides the most accurate measurement. Avoid measuring after coffee, exercise, or stress.

Where should I measure waist circumference?

Measure at the level of your navel (belly button), standing upright, with the tape parallel to the floor. Exhale normally, then measure, do not suck in your stomach. The tape should be snug but not compressing the skin. For consistency, measure in the same position at the same time of day. Morning, before eating or drinking, gives the most consistent results.

Can I improve my VO2max significantly through training?

Yes. VO2max is one of the most trainable physiological parameters. Untrained individuals can improve it by 15 to 25% over 8 to 12 weeks of structured aerobic training. The most effective training is high-intensity interval training (HIIT), specifically the Norwegian 4×4 protocol developed at NTNU: 4 intervals of 4 minutes at 90 to 95% max heart rate. Even moderate aerobic exercise 3× per week produces meaningful improvements within months.

Does VO2max decline with age?

Yes. VO2max declines approximately 1% per year after age 25 in sedentary individuals. However, regular endurance training dramatically slows this decline, trained individuals lose VO2max at roughly half the rate of sedentary peers. Competitive masters athletes who continue training into their 60s and 70s often maintain VO2max values equivalent to untrained 30-year-olds. Age-related decline is partly reversible at any age through consistent aerobic exercise.