Heart Rate Zone Calculator
Training heart-rate zone calculator using age-based estimated maximum heart rate or the Karvonen heart-rate reserve method.
Estimate five broad training zones from an age-based maximum heart rate or from heart-rate reserve when resting heart rate is provided. Age formulas are population estimates and can differ substantially from an individual's measured maximum.
This is for general fitness planning, not medical diagnosis. Medications and health conditions can change heart-rate response; consult a qualified clinician for individualized limits.
Frequently asked questions
Is age-based maximum heart rate exact?
No. It is a population estimate and individual values can differ.
What is heart-rate reserve?
It is estimated maximum heart rate minus resting heart rate; the Karvonen method adds a percentage of that reserve back to rest.
Can medications affect zones?
Yes. Some medicines and medical conditions alter heart-rate response. Seek individualized advice when relevant.