Utility
Heart Rate Zone Calculator
Privacy Verified
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.
Privacy & Security
Runs entirely in your browser. No data is sent to any server.
Data: None
Client-side-Side
Active
v1.0
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.