Heart Rate Reserve Calculator - HRR & Training Zone Calculator
Calculate Heart Rate Reserve (HRR) and optimal training zones using the Karvonen method. Find your target heart rate zones for fat burn, cardio, and peak performance.
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About Heart Rate Reserve
Heart Rate Reserve (HRR) is the difference between your maximum heart rate and resting heart rate. It represents your hearts capacity to work during exercise.
The Karvonen method uses HRR to calculate more accurate training zones based on your fitness level. Higher zones indicate higher intensity workouts.