Target Heart Rate Calculator (Karvonen)
Your training heart rate using the Karvonen heart-rate-reserve method.
Result
Target heart rate (bpm)
151
Max heart rate (bpm)
190
How it works
THR = rest + intensity × (220 − age − rest)
The Karvonen method bases your target on heart-rate reserve (max minus resting), giving a more personal zone than a flat percentage of max.
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Frequently asked questions
Why use resting heart rate?
It personalises the zone — two people the same age can have very different reserves.
What intensity should I pick?
50–70% for easy/fat-burning, 70–85% for endurance and tempo work.
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