Choose Your Estimation Method
Three science-validated approaches — pick the one you can do today
Run 1.5 miles (2.4 km) as fast as possible on a flat surface. Record your time below. Uses the Larsen equation (validated to within ±3.5 ml/kg/min of lab VO₂ max).
Uses the Uth-Sørensen-Overgaard-Pedersen formula. Measure your resting heart rate upon waking (before getting out of bed) for 3 consecutive mornings and use the average.
Leave blank to estimate: 208 − (0.7 × age)
The Cooper 12-minute run test: run as far as possible in exactly 12 minutes on a flat track. Record total distance. Uses the original Cooper (1968) formula.
VO₂ Max Reference Ranges by Age
Men's values — women's categories are typically 5–10 ml/kg/min lower
| Age | Poor | Fair | Good | Excellent | Superior |
|---|---|---|---|---|---|
| 20–29 | ≤38 | 39–43 | 44–51 | 52–56 | 57+ |
| 30–39 | ≤34 | 35–39 | 40–47 | 48–51 | 52+ |
| 40–49 | ≤30 | 31–35 | 36–43 | 44–47 | 48+ |
| 50–59 | ≤25 | 26–31 | 32–39 | 40–43 | 44+ |
| 60–69 | ≤20 | 21–26 | 27–35 | 36–39 | 40+ |
| 70+ | ≤17 | 18–22 | 23–29 | 30–35 | 36+ |
VO₂ Max — The Most Important Number in Longevity Science
VO₂ max (maximal oxygen uptake) is the maximum rate at which your body can consume oxygen during intense exercise. It measures the combined efficiency of your cardiovascular system (heart pumping blood), pulmonary system (lungs exchanging oxygen), and muscular system (extracting oxygen from blood). In ml/kg/min, it represents how many millilitres of oxygen your body can use per kilogram of bodyweight per minute at maximum effort.
VO₂ max is measured in ml of O₂ per kilogram of bodyweight per minute (ml/kg/min). Elite Tour de France cyclists often exceed 80–90 ml/kg/min. Average sedentary 40-year-old men average around 35 ml/kg/min. Trained recreational runners typically range from 45–60 ml/kg/min.
Why VO₂ Max Is the #1 Longevity Biomarker
A landmark 2018 study in JAMA Network Open of over 122,000 patients found that cardiorespiratory fitness (measured by VO₂ max) was the strongest independent predictor of mortality — stronger than smoking, diabetes, hypertension, or end-stage kidney disease. Crucially, there was no upper limit to the benefit: higher fitness always meant lower mortality risk, with no plateau. Elite-fit individuals had a 5× lower mortality risk than those in the lowest fitness category.
Peter Attia, MD (author of Outlive) calls VO₂ max the most important metric he tracks for longevity. His goal for patients is to maintain the fitness of someone 20 years younger than their biological age by training specifically to elevate and maintain VO₂ max throughout life.
How to Improve Your VO₂ Max
- Zone 2 cardio (80% of training): Long, easy aerobic sessions at the upper end of comfortable conversation pace build mitochondrial density and stroke volume over time. Most effective long-term adaptation.
- HIIT / VO₂ max intervals (20% of training): Short 3–8 minute intervals at 90–100% effort with 1:1 rest ratios drive rapid VO₂ max improvements. Classic 4×4 minute protocol (Norwegian method) is highly validated.
- Consistency over intensity: 3–5 days per week of aerobic work over months and years produces larger VO₂ max improvements than any single training style
- Strength training: Surprisingly effective at improving VO₂ max in sedentary individuals by improving muscle oxidative capacity
Field estimates (run tests, RHR method) are accurate to within ±3–5 ml/kg/min of gold-standard laboratory graded exercise testing for most people. This is sufficient for tracking change over time and categorizing fitness level. For clinical or research purposes, lab testing remains the standard. Modern wrist wearables (Garmin, Apple Watch) estimate VO₂ max to within ±5% using HR during running, which is acceptable for trend tracking.