Introducing the Fitness Age Calculator

A VO₂ max reading like “48 ml/kg/min” is hard to interpret on its own. The new Fitness Age Calculator translates it into something everyone understands — an age — by finding the age at which your VO₂ max would be average.

What it does

• Fitness age: the age your cardiorespiratory fitness corresponds to.
• Difference: how many years younger or older that is than your real age.
• Category: a five-band rating from Excellent to Poor.
• VO₂ max estimator: don’t know your number? Estimate it from age, sex, and activity.
• Client-side: your health inputs never leave your device.

Why it matters

Cardiorespiratory fitness is one of the strongest predictors of long-term health — and one of the most trainable. Expressing it as an age makes progress tangible and motivating: watch the number fall as your training pays off.

Informational only. This tool is not medical advice. Talk to a healthcare professional before changing your exercise routine.

Learn more

For what VO₂ max measures and how to lower your fitness age safely, read What Is Fitness Age?. Then try the Fitness Age Calculator with your own numbers.