VO2 Max Estimator: aerobic capacity

VO2 max is the maximum amount of oxygen your body can utilize during intense exercise. This calculator estimates it using the Fox method based on maximum and resting heart rate.

Fox formula for VO2 max

The estimation is based on the relationship between heart rates:

VO2max ≈ 15 × (HRmax / HRrest)

Where HRmax is estimated as 220 − age and HRrest is your resting heart rate (measured in the morning upon waking). The result is expressed in ml/kg/min.

Example 1: active 30-year-old

Problem: Age: 30. HRrest: 60 bpm.

1. HRmax:
   • HRmax = 220 − 30 = 190 bpm.
2. VO2max:
   • VO2max ≈ 15 × (190 / 60) ≈ 15 × 3.17 ≈ 47.5 ml/kg/min.

Answer: Estimated VO2max ≈ 47.5 ml/kg/min (good level).

Example 2: sedentary 50-year-old

Problem: Age: 50. HRrest: 80 bpm.

1. HRmax:
   • HRmax = 220 − 50 = 170 bpm.
2. VO2max:
   • VO2max ≈ 15 × (170 / 80) ≈ 15 × 2.125 ≈ 31.9 ml/kg/min.

Answer: Estimated VO2max ≈ 31.9 ml/kg/min (low level).

VO2 max classification

• Excellent: > 52 ml/kg/min (men), > 47 (women)
• Good: 43-52 (men), 36-47 (women)
• Average: 34-43 (men), 27-36 (women)
• Low: < 34 (men), < 27 (women)

Common uses of VO2 max

• Evaluating aerobic capacity and overall fitness.
• Tracking cardiovascular improvement with training.
• Setting training zones based on VO2.
• Comparing performance between athletes of different sports.
• Evaluating cardiovascular risk (low VO2 = higher risk).
• Planning personalized training programs.

Common mistakes with VO2 max

• Using a resting HR measured after activity or stress.
• Blindly trusting the estimate without a lab test.
• Not considering that the Fox formula is an approximation.
• Comparing values without considering age and sex.

Pro tip

Measure your resting HR for 3 consecutive mornings and use the average. Regular aerobic training can reduce your resting HR and significantly increase your VO2max in 3-6 months.