VO2 Max Estimator
Estimate VO2 max from resting and maximum heart rate (Uth-Sørensen method) with fitness ratings by age and sex.
About this tool
VO2 max is the number behind every cardio claim: it tracks cardiovascular fitness, predicts endurance performance and correlates with long-term health. This estimator derives it from your resting and maximum heart rate.
Measure resting heart rate on waking, repeat the estimate monthly, and you have a free fitness trend line that most wearables charge for.
FAQ
What is VO2 max?
The maximum rate your body can use oxygen during exercise — the standard measure of cardiovascular fitness and a strong predictor of longevity.
How accurate is this estimate?
The Uth-Sørensen method (15 x max HR / resting HR) typically lands within 10-15%, good enough to track trends over months.
How do I improve it?
Zone 2 base work 3-4 hours weekly plus one interval session. Expect 5-10% improvement in 8-12 weeks with consistency.