Phase 6 · Biometric & Longevity
VO2 Max & Fitness Age Calculator
Cardio fitness is the closest thing to a longevity dial. Estimate your VO2 max from a field test, then see whether your body is fitter — or older — than your age.
Educational estimate — train safely. Field-test VO2 max is an approximation, and maximal exertion carries risk. Consult a physician before strenuous testing, especially if you're new to exercise, older, or have any heart or health condition.
What is a good VO2 max for my age?
A good VO2 max is one above the average for your age and sex. Average cardiorespiratory fitness peaks in the mid-20s — around 50 mL/kg/min for men and 42 for women — then declines roughly 0.4 mL/kg/min per year, so a 45-year-old man near 42 is about average. Trained endurance athletes can exceed 60.
- VO2 max is the maximum volume of oxygen your body can use per minute per kilogram of body weight, measured in mL/kg/min.
- This calculator scores you against an age- and sex-adjusted reference and returns a band: Below average, Fair, Good, Excellent or Superior.
- Fitness age is the age at which your VO2 max would be average — a 45-year-old with the VO2 max of a typical 35-year-old has a fitness age of about 35.
- The Cooper 12-minute run estimates it as (distance in metres − 504.9) ÷ 44.73 (Cooper KH, JAMA, 1968); the Rockport 1-mile walk uses time, heart rate, weight, age and sex.
Under the hood
The formulas, fully cited
Two validated field-test equations, plus an age- and sex-normed comparison:
Cooper: VO2 max = (distance in metres − 504.9) ÷ 44.73
Rockport: VO2 max = 132.853 − 0.0769·weight(lb) − 0.3877·age + 6.315·(sex: 1 male/0 female) − 3.2649·time(min) − 0.1565·HR
Peak METs = VO2 max ÷ 3.5
Fitness age ≈ the age at which average VO2 max equals yours
- Source — Cooper: Cooper KH. "A means of assessing maximal oxygen intake." JAMA. 1968;203(3):201–204.
- Source — Rockport: Kline GM, et al. "Estimation of VO2max from a one-mile track walk." Med Sci Sports Exerc. 1987;19(3):253–259.
- Field tests are estimates: effort, terrain, weather and pacing all introduce error. Treat the trend across repeated tests as the real signal, not any single value.
Your directives
What to do next, based on your numbers
Adjust the sliders to generate tailored recommendations.
Answers
Frequently asked questions
What is VO2 max and why does it matter?
VO2 max is the maximum volume of oxygen your body can use per minute, per kilogram of body weight — the single best measure of cardiovascular fitness. It matters because it's one of the strongest predictors of longevity in the research: higher cardiorespiratory fitness is associated with substantially lower all-cause mortality. Improving it is one of the most evidence-backed things you can do for healthspan.
Cooper vs Rockport — which test should I use?
Use the Cooper test (how far you run in 12 minutes) if you can run — it's a near-maximal effort and quite accurate. Use the Rockport test (time and heart rate for a 1-mile walk) if running isn't suitable; it's a submaximal estimate that's gentler and safer for beginners or older adults. This tool computes both so you can compare.
What's a good VO2 max for my age?
It declines with age and differs by sex. The reference this calculator scores against takes an average of about 50 mL/kg/min for men and 42 for women in the mid-20s, declining roughly 0.4 mL/kg/min per year thereafter — so an average 45-year-old man sits near 42 and a woman near 34. "Good" is simply above that average for your age and sex; trained endurance athletes can exceed 60. Published norms vary by population and testing protocol, so treat this as a simplified reference, not a clinical cutoff.
What is "fitness age" and how is it calculated?
Fitness age is the age at which your VO2 max would be average. If a 45-year-old has the VO2 max typical of an average 35-year-old, their fitness age is about 35 — a decade "younger" than their calendar age. It reframes cardio fitness as a biological age you can actually move: this tool estimates it by finding the age whose age- and sex-normed average VO2 max matches your result. A fitness age below your real age is the goal, and consistent training lowers it over months.
How do I find my VO2 max percentile by age?
Your percentile is where your VO2 max falls in the range for your age and sex — the 60th percentile means you are fitter than 60% of peers. Because norms decline with age, the same raw number is a higher percentile at 55 than at 25. This calculator converts your estimate into an age- and sex-adjusted fitness category — Below average, Fair, Good, Excellent or Superior — which run from the lowest to the highest percentile bands, so you can see your standing by age without a separate chart.
How do I improve my VO2 max?
The proven recipe is a mix of high-volume easy cardio (Zone 2) to build your aerobic base, plus a weekly dose of high-intensity intervals (e.g. 4×4 minutes hard) to push the ceiling. Consistency over months moves the number more than any single workout. Even modest gains in VO2 max correlate with meaningful drops in mortality risk.