Heart Rate Reserve Calculator

Calculate heart rate reserve (HRR = HRmax - HRrest) using the Karvonen method to set training target zones.

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Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Calculate heart rate reserve (HRR = HRmax - HRrest) using the Karvonen method to set training target zones

Each component has a specific meaning:

  • Karvonen method — The karvonen method recorded for the scenario being assessed.

Note: Interpret the heart rate reserve result against the thresholds and context described above.

How to Use

Enter the Karvonen method for the scenario you are assessing. Calculate heart rate reserve (HRR = HRmax - HRrest) using the Karvonen method to set training target zones. Use the heart rate reserve result to inform your calculation.

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