What is VO2max?
VO2max — maximal oxygen uptake — is the highest rate at which your body can take in, transport and use oxygen during all-out exercise. It is expressed in millilitres of oxygen per kilogram of body weight per minute (ml/kg/min) and is one of the three pillars of endurance performance, together with lactate threshold (how much of that capacity you can sustain) and running economy (how much oxygen you need at a given pace).
A laboratory test on a treadmill with gas analysis is the gold standard. The four field methods in this calculator are practical estimates you can do on your own.
The four estimation methods
| Method | Formula | Best for |
|---|---|---|
| Race (VDOT) | Daniels & Gilbert oxygen-cost and %VO2max-for-duration equations | Runners with a recent all-out race. Includes running economy, so it predicts performance well. |
| Cooper 12-minute run | VO2max = (distance in m − 504.9) ÷ 44.73 | A simple self-test on a 400 m track. |
| 1.5-mile run test | VO2max = 3.5 + 483 ÷ time in minutes | Fitness testing; used by many military and public-service fitness programmes. |
| Heart rate ratio (Uth) | VO2max = 15.3 × max HR ÷ resting HR | A quick estimate without any running test. Least precise. |
Worked examples
- Cooper: 2,600 m in 12 minutes → (2600 − 504.9) ÷ 44.73 = 46.8 ml/kg/min.
- 1.5 mile: 12:30 → 3.5 + 483 ÷ 12.5 = 42.1 ml/kg/min.
- Heart rate: max 185, resting 55 → 15.3 × 185 ÷ 55 = 51.5 ml/kg/min.
- Race: a 25:00 5K → VDOT 38.3.
Cooper test distance chart
Estimated VO2max for distances covered in 12 minutes, with the equivalent average pace.
| 12-min distance | Avg pace /km | Est. VO2max |
|---|---|---|
| 1600 m (0.99 mi) | 7:30 | 24.5 |
| 1800 m (1.12 mi) | 6:40 | 29.0 |
| 2000 m (1.24 mi) | 6:00 | 33.4 |
| 2200 m (1.37 mi) | 5:27 | 37.9 |
| 2400 m (1.49 mi) | 5:00 | 42.4 |
| 2600 m (1.62 mi) | 4:37 | 46.8 |
| 2800 m (1.74 mi) | 4:17 | 51.3 |
| 3000 m (1.86 mi) | 4:00 | 55.8 |
| 3200 m (1.99 mi) | 3:45 | 60.3 |
| 3400 m (2.11 mi) | 3:32 | 64.7 |
| 3600 m (2.24 mi) | 3:20 | 69.2 |
| 3800 m (2.36 mi) | 3:09 | 73.7 |
How to run the Cooper test
- Use a 400 m track so you can count laps accurately, on a calm, cool day.
- Warm up with 10–15 minutes of easy running and a few short strides.
- Run as far as you can in exactly 12 minutes, pacing evenly. Note the distance to the nearest 50 m.
- Enter the distance above. Repeat every 6–8 weeks to track progress.
Maximal tests are hard. Field tests require an all-out effort. If you are new to exercise, have health concerns or any heart-related symptoms, speak to a doctor first and use the heart-rate method instead.
Can you improve your VO2max?
Yes — especially if you are relatively new to training. Consistent aerobic volume builds a bigger heart and more capillaries, and intervals at roughly 3K–5K race pace (3–5 minute repeats) stress VO2max directly. Gains tend to be rapid in the first months and slower afterwards; performance can keep improving for years through gains in threshold and economy even when VO2max plateaus.
Turn your estimate into training with the VDOT training pace calculator, and set effort by heart rate with the heart rate zone calculator.
- Cooper KH (1968). A means of assessing maximal oxygen intake. JAMA 203(3):201–204.
- Uth N, Sørensen H, Overgaard K, Pedersen PK (2004). Estimation of VO2max from the ratio between HRmax and HRrest — the Heart Rate Ratio Method. Eur J Appl Physiol 91(1):111–115.
- Daniels J, Gilbert J (1979). Oxygen Power.
Last reviewed: September 2026 · Health disclaimer