Fitness estimate, not a diagnosis
Fitness Age Calculator
Your fitness age estimates how old your body performs, versus your actual age, using resting heart rate, activity level and a 30-second sit-to-stand test. A lower fitness age is the goal, and it is influenced by training habits.
How to use this result
Treat the result as a general estimate, not a diagnosis or a personalised prescription. Its accuracy depends on the inputs and assumptions used by the tool. A trend over time is more useful than treating one number as a verdict.
Chronological age is fixed. Fitness age is not. This quick estimate blends three markers that can change with training, resting heart rate, weekly activity, and lower-body strength-endurance, into a single number you can move.
How the estimate works
- Resting heart rate reflects cardiovascular efficiency, lower is generally fitter.
- Weekly activity captures your training habit.
- The sit-to-stand test in 30 seconds reflects leg strength and endurance, a strong marker of functional age.
How this informal estimate is built
This is a KinesioFitness coaching heuristic that combines age, resting heart rate, activity and sit-to-stand performance. It has not been clinically validated and should not be compared with a laboratory fitness-age test.
- The result is for reflection only, not diagnosis, medical clearance or a validated fitness score.
- Small input changes can change the output, so do not track it as a precise health measure.
Frequently Asked Questions
Is this a medical test?+
No. It is a rough fitness estimate for motivation and direction, not a diagnosis. For heart or health concerns, see your doctor.
How do I lower my fitness age?+
Two strength sessions plus some easy Zone 2 cardio each week moves all three markers. Many people see change within 6–8 weeks.
Want to turn this estimate into a practical plan?
Share your result and main goal. We can explain a sensible next step for your current level.