Heart Rate Zones Calculator
Estimate five zones using maximum-heart-rate percentages or the Karvonen heart-rate-reserve method.
Estimated result
Enter a valid age and, for Karvonen, a resting heart rate below the maximum.
Zones are general estimates. Medication, conditions, and individual variation can change heart-rate response.
HRmax or Karvonen
Percentage mode uses maximum HR; Karvonen applies percentages to the reserve between maximum and resting HR.
Estimated maximum HR
Without a known measured value, 208 − 0.7 × age is used as a population reference.
Frequently asked questions
Are these clinical zones?
No. They are general exercise ranges and can vary with medication or conditions.
Is personal data sent to a server?
No. Calculations run locally in your browser and these values are not stored by default.
Can I use the result as medical advice?
No. It is an educational reference and does not replace individual assessment.
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