What the tool does, how to run it, and what to expect from the result.
Karvonen uses heart rate reserve, the gap between maximum and resting: target = resting + (max − resting) × intensity. Age 35 gives a max of 185; with a resting pulse of 65 the reserve is 120, so 70% is 65 + 84 = 149 bpm. Because it includes resting heart rate, it fits fit and unfit people better than a flat percentage of max.
A quick way to understand who this helps, what it solves, and where it connects next.
Anyone tracking fitness or health numbers, plus students and clinicians double-checking a formula.
Using the target heart rate calculator without installing anything or signing up.
Short answers for the questions people usually have before trying a utility like this.
Usually 60-70% of heart rate reserve (zone 2). You burn a higher share of fat there, but more total calories at higher intensity.
Count your pulse for 60 seconds right after waking, before getting up, on three mornings, and average them.
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Enter your numbers and the result updates live in your browser. Nothing is uploaded and no server is used.
Calculations run locally in your browser. An estimate for general guidance, not medical advice.