Heart Rate Calculator

Free heart rate calculator. Find your maximum heart rate and training zones using the Karvonen method.

How the Heart Rate Calculator works

Maximum heart rate is estimated as 220 minus your age. The Karvonen method then calculates each training zone by taking a percentage of your heart rate reserve (the gap between max and resting heart rate) and adding it back to your resting heart rate, giving personalized zones rather than a one-size-fits-all range.

Formula

Target HR = Resting HR + (Max HR − Resting HR) × Intensity

How to use the Heart Rate Calculator

  1. 1The heart rate calculator is designed to be simple and fast.
  2. 2Enter your age.
  3. 3Enter your resting heart rate.
  4. 4See your training zones.
  5. 5Your result is shown immediately.

Examples

  • Age 30, resting 60 bpm = Max 190 bpm
  • Zone 3 target: 144-155 bpm

Benefits

  • Completely free with no signup required.
  • Runs entirely in your browser for instant results and privacy.
  • Works on mobile, tablet and desktop.
  • Results can be copied with one click.

Frequently Asked Questions

Is the heart rate calculator free to use?

Yes. The heart rate calculator is 100% free, with no signup, no watermark and no hidden limits.

Does the heart rate calculator store my data?

No. All calculations and processing happen locally in your browser. Nothing is uploaded to a server.

Does the heart rate calculator work on mobile?

Yes. The heart rate calculator is fully responsive and works on phones, tablets and desktop computers.

What is the Karvonen method?

The Karvonen method uses your resting heart rate to calculate personalized training zones: Target HR = Resting HR + (Max HR - Resting HR) × intensity.

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