Heart Rate Reserve (Karvonen) Calculator
Find training zones using the Karvonen method.
How it works
Fill in the 2 fields above and Heart Rate Reserve (Karvonen) Calculator calculates the result instantly, recalculating as you change any value. The math runs locally in your browser — nothing is sent to a server.
Examples
- Age 30, Resting HR 60 bpm → Moderate (50–70%): 125–151 bpm
Frequently asked questions
How do I use the Heart Rate Reserve (Karvonen) Calculator?
Enter your values in the 2 input fields and the result is calculated automatically as you type. Change any value to see the numbers update instantly.
Is my data private?
Yes. The Heart Rate Reserve (Karvonen) Calculator runs entirely in your browser. Nothing you enter is uploaded, saved to a server, or shared — it never leaves your device.
Is the Heart Rate Reserve (Karvonen) Calculator free?
Yes, it is completely free with no sign-up, no limits and no watermarks. Like every tool on health & fitness and the rest of the platform, you can use it as often as you like.
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