VO₂ Max Calculator
Estimate aerobic fitness from a resting heart rate, a 1.5-mile run or the Cooper test.
Please note: For general information only. This is not medical advice — speak to a doctor or registered dietitian before changing your diet, training or medication.
What the VO₂ Max Calculator does
VO₂ max is the maximum volume of oxygen your body can use per kilogram per minute. It is the single best laboratory measure of aerobic fitness and correlates strongly with endurance performance and long-term health.
Formula
Heart rate method: VO₂ max = 15.3 × (Max HR ÷ Resting HR)Cooper test: VO₂ max = (Distance in metres − 504.9) ÷ 44.731.5 mile run: 88.02 − 0.1656 × weight(lb) − 2.76 × time(min) + 3.716 (if male)
Inputs explained
| Input | Unit | Required | Notes |
|---|---|---|---|
| Method | one of 3 options | Yes | — |
| Age | years | Yes | Accepts 10 or more, up to 100. |
| Sex | one of 2 options | Yes | — |
| Resting heart rate | bpm | In some modes | Accepts 30 or more, up to 120. Shown Method is Resting heart rate (no test needed). |
| Distance covered in 12 minutes | metres | In some modes | Accepts 100 or more. Shown Method is Cooper test — distance in 12 minutes. |
| Run time — minutes | number | In some modes | Accepts 1 or more. Shown Method is 1.5 mile run time. |
| Run time — seconds | number | Optional | Accepts 0 or more, up to 59. Shown Method is 1.5 mile run time. |
| Weight | kg | In some modes | Accepts 1 or more. Shown Method is 1.5 mile run time. |
How to use it
- Choose Method and Sex.
- Enter Age.
- Fill in the remaining inputs the form shows for your choice.
- Select Calculate.
Worked example
A 30-year-old with a resting heart rate of 55 bpm.
- Method
- Resting heart rate
- Age
- 30
- Resting
- 55
Max HR 187, so 15.3 × (187 ÷ 55) = 52.0 ml/kg/min — excellent.
Frequently asked questions
How do I improve VO₂ max?
A mix of high-volume easy aerobic work and short high-intensity intervals. Most gains come in the first few months of consistent training.
Why does VO₂ max fall with age?
Maximum heart rate declines and muscle mass drops. Regular training slows the decline substantially.
Method and sources
Method. Two published estimates: the heart-rate-ratio method, VO₂ max ≈ 15.3 × (maximum ÷ resting heart rate), and the Cooper distance test.
Assumptions
- Resting heart rate was measured genuinely at rest, and maximum heart rate is either measured or estimated by an age equation with its own wide scatter.
- For the distance test, the effort was maximal and evenly paced on a flat course.
Limitations
- These are estimates from surrogate measures. Laboratory VO₂ max is measured from expired gas; a heart-rate ratio is a proxy for it, and individual results scatter widely around the prediction.
- Anything that shifts heart rate shifts the estimate — beta blockers, caffeine, illness, heat, altitude, poor sleep — without any change in actual fitness.
- A maximal-effort field test is itself a cardiovascular stress, and is not appropriate for anyone unaccustomed to hard exercise or with a known cardiac condition.
Sources
- Estimation of VO₂max from the ratio between HRmax and HRrest — the Heart Rate Ratio Method — European Journal of Applied Physiology 91(1):111–115 (Uth, Sørensen, Overgaard and Pedersen), 2004. The 15.3 × (HRmax ÷ HRrest) heart-rate-ratio estimate.