VO₂ Max Calculator
Estimate VO₂ max from the Cooper 12-min run, Rockport 1-mile walk, or resting heart rate.
Written by Golam Rabbani, Founder & Lead Engineer
How to use this vo₂ max calculator
- Choose a method: Cooper 12-min run, Rockport 1-mile walk, or Resting HR (Uth–Sørensen).
- Enter your sex and age (used for ACSM fitness categories and for the Rockport equation).
- Fill in the method-specific inputs: distance for Cooper, walk time + finishing HR + weight for Rockport, or resting and max HR for Uth–Sørensen.
- Click Calculate to see your VO₂ max in ml/kg/min plus a fitness category.
- Copy the result or Reset to try a different method.
About this vo₂ max calculator
The VO₂ Max Calculator estimates aerobic fitness — the maximum volume of oxygen your body can use per minute, normalised to body weight — using three published submaximal methods. Cooper 12-minute run: VO₂ = (meters − 504.9) / 44.73, derived from Kenneth Cooper’s 1968 military study. Rockport 1-mile walk: VO₂ = 132.853 − 0.0769·lb − 0.3877·age + 6.315·sex − 3.2649·time(min) − 0.1565·finishHR (Kline et al., 1987). Resting HR estimate: VO₂ max ≈ 15.3 × (MHR / RHR), the Uth–Sørensen 2004 equation. As a worked example, a 30-year-old male who covers 2,800 m in the Cooper test scores (2800 − 504.9) / 44.73 ≈ 51.3 ml/kg/min — an Excellent rating on the ACSM table. Fitness categories shown reflect adult 30–39 reference ranges; older adults score lower for the same absolute fitness. This tool is for general education and is not medical advice — consult a qualified healthcare professional before performing a max-effort run test, especially with heart, joint, or respiratory conditions.
FAQ
- Which method is most accurate?
- A true VO₂ max test in a lab with breath-by-breath gas analysis is the gold standard. Of the three field tests here, Cooper is the most accurate for fit runners, Rockport for sedentary or older adults, and the resting-HR estimate is the least precise but requires no exertion.
- Why does the formula need my body weight in pounds for Rockport?
- The Kline et al. equation was published with pounds. The calculator converts automatically if you enter kilograms.
- What does the fitness category mean?
- Categories reflect ACSM/Heyward reference percentiles for adults aged 30–39. Older adults score lower for the same effort, so an Excellent rating at 60 might be Good at 30 in absolute terms.
- How can I improve my VO₂ max?
- High-intensity intervals (4×4 minutes at 90–95% MHR) and large total aerobic volume are the most evidence-backed levers. Improvements of 10–20% in 8–12 weeks are realistic for untrained individuals.
- Why are my Cooper and Rockport results different?
- The two methods test different effort domains. Cooper measures near-maximum sustained pace; Rockport extrapolates from submaximal walking. A 3–6 ml/kg/min spread between methods is normal.