VO2 Max Estimator
Estimate VO2 max in mL/kg/min from age and resting heart rate using the Uth-Sorensen formula.
Returns aerobic fitness category by age group and gender.
VO2 max (maximal oxygen uptake) is the gold standard measure of cardiovascular fitness — the maximum volume of oxygen your body can utilize per minute during intense exercise.
Units: milliliters of oxygen per kilogram of body weight per minute (mL/kg/min)
Field-test estimation formulas:
Cooper 12-Minute Run Test: VO2 max = (Distance in meters − 504.9) ÷ 44.73
Rockport Walk Test (1-mile walk): VO2 max = 132.853 − (0.0769 × Weight lbs) − (0.3877 × Age) + (6.315 × Gender) − (3.2649 × Walk Time min) − (0.1565 × Heart Rate) (Gender: Male = 1, Female = 0)
Heart Rate Reserve Method (approximate): VO2 max ≈ 15 × (Max HR ÷ Resting HR)
VO2 max fitness classification (mL/kg/min):
| Category | Men (Age 30–39) | Women (Age 30–39) |
|---|---|---|
| Elite athlete | 60+ | 52+ |
| Excellent | 52–60 | 45–52 |
| Good | 43–52 | 37–45 |
| Fair | 36–43 | 31–37 |
| Poor | Below 36 | Below 31 |
Worked example — Cooper Test: A 35-year-old man runs 2,600 meters in 12 minutes. VO2 max = (2,600 − 504.9) ÷ 44.73 = 2,095.1 ÷ 44.73 = 46.8 mL/kg/min Classification: Good for his age group
Improving VO2 max:
- High-Intensity Interval Training (HIIT): 4–6× weekly intervals at 90–95% max HR
- Typical improvement for untrained adults: 10–20% in 8–12 weeks
- Elite athletes improve more slowly (1–3% per training cycle)
- Genetics determine upper ceiling; training determines where in that range you land
Why VO2 max matters beyond sport: Higher VO2 max correlates with dramatically reduced risk of cardiovascular disease, metabolic syndrome, and all-cause mortality. Research shows each 1 MET (3.5 mL/kg/min) improvement reduces cardiovascular mortality risk by ~15%.