Introducing the VO2 Max Estimator — Measure Your Cardio Fitness

VO2 max — how much oxygen your body can use at full effort — is one of the best single numbers for cardiovascular fitness. Today we’re launching the VO2 Max Estimator so you can get a useful estimate without a lab treadmill.

Informational only. This is a fitness estimate, not medical advice. Maximal-effort tests are strenuous — check with a doctor first if you have any health concerns.

What it does

Pick a method — your morning resting heart rate, or a Cooper 12-minute run — enter your age and gender, and the tool estimates your VO2 max in ml/kg/min, rates it against published fitness norms (Poor to Superior), and shows your METs ceiling and estimated max heart rate.

Two proven methods

The resting-HR method uses the Uth formula (15.3 × HRmax ÷ resting HR) and is effort-free. The Cooper test maps your 12-minute run distance to a VO2 max and is more accurate. Our VO2 max guide explains both and how to actually raise your number.

Pairs well with

Use the heart-rate zones tool to train at the right intensities, and the run pace calculator to pace your interval sessions.

What’s next

The free estimator is here to stay. For people who want to train rather than just measure, we’re planning a Pro tier with saved tests, a VO2 max trend chart, and personalised training zones. For now, get your baseline for free — try it out.