What is VO2 max?
VO2 max is the maximum amount of oxygen your body can take in and use per minute during all-out exercise, expressed in millilitres per kilogram of body weight per minute (mL/kg/min). It reflects how well your heart, lungs, blood, and muscles deliver and use oxygen — and it is one of the strongest single predictors of endurance performance.
You cannot measure true VO2 max without a lab and a mask, but you can estimate it well from a maximal running test or, more roughly, from your heart rate. This calculator supports both.
The Cooper 12-minute test
Developed by Dr Kenneth Cooper for the US military, the test is simple: run as far as you can in exactly 12 minutes on a flat course or track, then measure the distance. The formula is:
VO2 max = (distance in metres − 504.9) ÷ 44.73
Cover 2,400 m and your VO2 max is about 42; cover 3,200 m and it is about 60. Warm up well, pace it like a hard 12-minute time trial rather than a sprint, and repeat it every few weeks to track your progress.
The resting heart rate method
If you would rather not run a test, the Uth-Sorensen formula gives a rough estimate from two numbers: VO2 max ≈ 15.3 × (max HR ÷ resting HR). Because fitter runners have lower resting heart rates, a low resting pulse pushes the estimate higher.
It is convenient but less accurate than a run test — treat it as a ballpark and use the same method consistently so the trend is meaningful.
Cooper test distance to VO2 max
VO2 max for common 12-minute distances. These are the exact values this calculator produces.
| 12-min distance | VO2 max (mL/kg/min) |
|---|---|
| 1,600 m (1.0 mi) | 24.5 |
| 2,000 m (1.24 mi) | 33.4 |
| 2,400 m (1.49 mi) | 42.4 |
| 2,800 m (1.74 mi) | 51.3 |
| 3,200 m (1.99 mi) | 60.3 |
As a rough guide, recreational runners often sit in the 40s, well-trained club runners in the 50s, and elite endurance athletes in the 70s or higher. The trend matters more than the absolute number.
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The Running Genie estimates and trends your VO2 max from your actual training — no 12-minute test required — and builds the interval work that raises it.
Frequently asked questions
What is VO2 max?
VO2 max is the maximum amount of oxygen your body can use per minute during intense exercise, measured in mL/kg/min. It is one of the best single indicators of aerobic fitness — the higher your VO2 max, the more oxygen your muscles can use to sustain a fast pace.
How do I calculate VO2 max from the Cooper test?
Run as far as you can in exactly 12 minutes on a flat course, then measure the distance in metres. VO2 max = (distance in metres − 504.9) ÷ 44.73. Covering 2,400 m gives a VO2 max of about 42 mL/kg/min. This calculator does the maths and supports km and miles.
Can I estimate VO2 max from heart rate?
Yes, roughly. The Uth-Sorensen formula estimates VO2 max as 15.3 times your maximum heart rate divided by your resting heart rate. It needs no running test but is less accurate than a maximal run test — a low resting heart rate from good fitness pushes the estimate up.
What is a good VO2 max?
It depends on age and sex, but as a rough guide, recreational runners often sit in the 40s, well-trained club runners in the 50s, and elite endurance athletes in the 70s or higher. What matters most for you is the trend — a rising VO2 max means your aerobic fitness is improving.
How can I improve my VO2 max?
A combination of consistent easy aerobic mileage and regular high-intensity intervals at around 90–100% of max heart rate is the most effective way to raise VO2 max. Building your aerobic base first, then adding VO2 max intervals in the weeks before a race, produces the biggest gains.
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