Elspeth, after-work sniff walk
Max heart rate 185, Resting heart rate 62
45.7 ml/kg/min
Fitness Age in Dog Years
Fitness Age in Dog Years takes max heart rate, resting heart rate and turns them into a number you can read in one sitting. A simple Uth-style estimate. Not a lab VO2 test. It is a quick sense check in the browser, not a diagnosis.
Your details
Enter max heart rate, resting heart rate.
What is this calculator?
Fitness Age in Dog Years takes max heart rate, resting heart rate and turns them into a number you can read in one sitting. A simple Uth-style estimate. Not a lab VO2 test. It is a quick sense check in the browser, not a diagnosis.
How it works
- Enter max heart rate, resting heart rate in the units on the form.
- We apply the method described under the result.
- Read the number as a sketch. If it worries you, take the original figures to a GP.
Common questions
What is the fitness age in dog years calculator?
It turns max heart rate, resting heart rate into a fitness age in dog years figure you can read in one sitting. Use it as a guide, not a diagnosis.
Does this replace my GP?
No. The maths stays in your browser. Speak to a GP if you are worried about your health.
Can I treat the number as a target?
Treat it as a planning figure. Real weeks wobble. If a goal feels extreme, stop and get proper advice.
Example scenarios
Priya, Sunday park circuit
Max heart rate 220, Resting heart rate 75.6
44.5 ml/kg/min
Fran, wet morning loop
Max heart rate 144.3, Resting heart rate 48.4
45.6 ml/kg/min
Understanding your results
Treat this as a snapshot for fitness age in dog years, not a verdict. If the number worries you, take it to your GP rather than stacking new rules on yourself.
About this result
Guidance only. Calculations run in your browser. Numbers are estimates, not a diagnosis.
How we calculate
A simple Uth-style estimate. Not a lab VO2 test.
Sources
Method described on this page. We link NHS or GOV.UK guidance where it applies.
Limitations
- Illustration only.
- Not personal medical advice.
Spotted an error? Request a correction or read our editorial policy.