Share the basics
Enter the core measurements required by the published non-exercise equation.
Your fitness, made understandable
How old is your fitness?
See how your current fitness signals compare with your age, what shapes the estimate, and where a practical next step may help.
- A useful guest result without creating an account
- A range and confidence label instead of false precision
- Your assessment stays on this device unless you choose to sync later
A few useful signals
Quick to complete. Honest about uncertainty.
The quick assessment combines information you already know or can measure without an exercise test.
Get a bounded estimate
We show a Fitness Age range and confidence level, not an over-precise answer.
See what matters
Understand positive signals, opportunities, and which added measurements could improve confidence.
Built for curiosity, not judgment
Built for curiosity, not judgment
Transparent by design
See the inputs used, why they matter, and what the estimate cannot tell you.
Private by default
Use the calculator as a guest. Your quick assessment is stored locally on this device.
Useful at any starting point
Quick requires no exercise test, saves your draft, and explains how a measured test could improve confidence.
Focused tools
Understand the measurements behind fitness
Use a calculator on its own, then bring the result into a fuller assessment when it is relevant.
VO₂ max estimate
Estimate cardiorespiratory fitness from a carefully completed one-mile walk test.
Open VO₂ max calculatorHeart-rate zones
Create simple training ranges from a measured or age-estimated maximum heart rate.
Open heart-rate-zone calculatorWhat Fitness Age means
Fitness Age is an evidence-informed comparison, not a medical diagnosis, biological-age test, mortality prediction, or substitute for professional care. It can help you notice patterns and choose what to measure next.