Heart Rate Zone Calculator
Calculate your five heart-rate training zones from age, with the more accurate Karvonen method when you add resting heart rate.
Max HR estimated as 220 − age. With a resting HR, zones use the Karvonen (heart-rate reserve) method: target = rest + intensity × (max − rest). Educational only — not medical advice.
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Privacy & Security
Runs entirely in your browser. No data is sent to any server.
How to Use
Enter your age (and optionally resting heart rate). Your max HR and five training zones from recovery to peak update instantly.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.
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