VO2 Max Calculator
VO2 Max Calculator
Estimate Your Aerobic Fitness
Your Numbers
Estimated VO2 Max
mL/kg/min
Enter your numbers to see the estimate.
Understanding VO2 Max
VO2 max is the maximum rate at which your body can use oxygen during intense exercise -- widely considered the gold-standard measure of cardiovascular fitness. This calculator uses a "non-exercise" formula that estimates VO2 max from resting heart rate alone, without requiring a treadmill test.
Resting Heart Rate Reflects Fitness
A lower resting heart rate generally indicates a more efficient heart -- one that pumps more blood per beat -- which correlates with higher aerobic capacity.
The Formula
VO2 max ≈ 15.3 × (max heart rate ÷ resting heart rate), where max heart rate is estimated as 220 minus age.
Improves with Training
Regular cardiovascular exercise lowers resting heart rate over weeks to months, which this formula reflects as a rising VO2 max estimate.
An Estimate, Not a Lab Result
This non-exercise method is convenient but less accurate than a supervised graded exercise test with direct gas-exchange measurement.
Worked Example
Suppose you're 30 years old with a resting heart rate of 60 bpm:
- Estimated max heart rate: 220 − 30 = 190 bpm.
- VO2 max: 15.3 × (190 ÷ 60) ≈ 48.5 mL/kg/min.
Result
- Max HR: 190 bpm
- VO2 Max: 48.5 mL/kg/min
Key Takeaways
- Measure Resting HR Consistently: Take it in the morning before caffeine or activity for the most reliable reading.
- Track the Trend: A falling resting heart rate over weeks of training is a meaningful sign of improving fitness.
- Complements Pace and Heart Rate Tools: Pair this with the Target Heart Rate Calculator to plan training zones.