VO2 Max Calculator
Estimate aerobic fitness from the Cooper 12-minute run test.
Estimate VO2 max — a standard measure of aerobic fitness — from the distance you cover in a 12-minute run, using Kenneth Cooper's well-validated 1968 formula.
How to do the Cooper 12-minute test
- Warm up for 10 minutes with easy jogging and some light stretching.
- Run as far as you can in exactly 12 minutes at a steady, hard pace. A standard 400 m track makes measuring easy — or use a GPS watch or running app.
- Enter the distance in meters or miles.
- Cool down with a few minutes of walking.
Pace yourself evenly. Starting too fast is the most common mistake, and it usually lowers your distance.
Worked examples
| Distance in 12 minutes | Estimated VO2 max |
|---|---|
| 2,000 m (1.24 mi) | 33.4 mL/kg/min |
| 2,400 m (1.49 mi) | 42.4 mL/kg/min |
| 1.5 miles (2,414 m) | 42.7 mL/kg/min |
| 2,800 m (1.74 mi) | 51.3 mL/kg/min |
What the categories mean
This calculator uses general fitness categories: below 25 is very poor, 25–33 poor, 33–42 fair, 42–51 good, 51–56 excellent, and above 56 superior. They're not adjusted for age or sex. VO2 max naturally declines with age and is typically higher in men, so a "fair" score at 60 can be a strong result for that age group.
How to improve your VO2 max
- Intervals: short hard efforts — for example, 4 × 4 minutes at a hard pace with 3 minutes of easy recovery — are among the most effective ways to raise it.
- Easy aerobic miles: regular steady running, cycling or swimming builds the base.
- Consistency: most people see measurable gains within 6–12 weeks of regular training.
Retest every couple of months under similar conditions to track progress. Pair it with the heart rate zone calculator to plan your training intensity.
Frequently asked questions
What is VO2 max?
The maximum rate at which your body can use oxygen during intense exercise — a widely used measure of aerobic fitness, expressed in milliliters of oxygen per kilogram of body weight per minute (mL/kg/min).
How does the Cooper test work?
Run as far as you can in exactly 12 minutes. Kenneth Cooper's 1968 formula converts that distance into an estimated VO2 max: (distance in meters − 504.9) ÷ 44.73.
How accurate is this compared to a lab test?
A lab test with gas-exchange analysis is the gold standard, but the Cooper test is a well-validated, practical field estimate that's been used for decades in fitness testing.
Is the Cooper test safe for everyone?
It's a maximal effort, so it isn't right for everyone. If you're new to exercise, have heart or lung problems, or haven't been checked by a doctor recently, talk to one first. A gentler walking test may be a better start.
Can I do the test on a treadmill?
Yes. Set a 1% incline to roughly match the effort of running outdoors, and read the distance from the treadmill display after 12 minutes.