See the Zone 2 method with the number
The age-based method builds percentage ranges from an estimated maximum heart rate. When resting heart rate is entered, the Karvonen method also uses heart-rate reserve, so the results do not have to match.
How to use it
- 1Enter your age; optionally use an average of calm resting readings.
- 2Check which method was used in the result.
- 3Interpret the number alongside talk comfort and perceived effort.
How should you read it?
Without a resting heart rate, the tool shows only an age-based estimate. If your watch and breathing feel disagree, forcing the number is less useful than reducing intensity and observing the response.
Keep the limits in view
Medication, rhythm conditions, device error, and individual variation can change the result. Seek professional guidance for a heart condition or related concern.