VO2 Max Calculator: Estimate Your Fitness Age (2026)
Use our free VO2 Max Calculator to estimate your maximal oxygen uptake using one of two field tests. Choose the 1-mile Rockport walk test (enter weight, age, sex, walk time, and ending heart rate) or the 12-minute Cooper run test (enter distance). Get your VO2 max in ml/kg/min plus a general fitness rating. No signup, no upload.
How VO2 Max Is Estimated
VO2 max is the maximum oxygen your body can use during intense exercise — the gold standard for cardiorespiratory fitness. The Rockport test uses the formula with walk time, heart rate, weight, age, and sex. The Cooper test estimates VO2 max from distance covered in 12 minutes. A higher VO2 max is linked to better endurance and longevity.
How to Use Our VO2 Max Calculator
- Open the VO2 Max Calculator tool.
- Pick a test: 1-mile walk or 12-min run.
- Enter the measurements for that test.
- Read your estimated VO2 max.
- Compare against the fitness rating.
VO2 Max Fitness Rating (Adults)
| Rating | Men (40-49) | Women (40-49) |
|---|---|---|
| Superior | 46+ | 39+ |
| Excellent | 41-45 | 34-38 |
| Good | 35-40 | 30-33 |
| Fair | 31-34 | 26-29 |
| Poor | <31 | <26 |
Common Use Cases for a VO2 Max Calculator
- Fitness assessment — measure your cardiovascular fitness level.
- Training progress — track VO2 max changes over a training program.
- Running baseline — establish a fitness baseline before starting a running plan.
- Health screening — use VO2 max as a health and longevity marker.
- Athletic testing — estimate VO2 max without lab equipment.
FAQ
What is VO2 max?
VO2 max is the maximum amount of oxygen your body can use during intense exercise, measured in ml/kg/min. It is the best single measure of cardiorespiratory fitness.
How does the Rockport walk test work?
You walk one mile as fast as you can, then record your time and ending heart rate. The calculator combines those with your weight, age, and sex to estimate VO2 max.
How does the Cooper 12-minute run work?
You run as far as possible in 12 minutes and enter the distance. Cooper’s formula estimates VO2 max from that distance.
What is a good VO2 max?
For general adults, 49-59 ml/kg/min is excellent and 60+ is superior. Below 30 is poor. Norms vary by age and sex.
Is this VO2 max calculator free?
Yes, completely free with no signup. All math runs in your browser — nothing is uploaded.
Try our free VO2 Max Calculator to estimate your cardiovascular fitness from a simple field test.