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Heart Rate Zone Calculator
Calculate your cardio training zones based on maximum heart rate.
About This Calculator
Heart rate zones using the Karvonen method (Heart Rate Reserve) are more accurate than simple percentage of max HR. Zone 2 training (60–70% of HRR) is the foundation of endurance training and longevity — researchers like Dr. Peter Attia and Dr. Phil Maffetone recommend spending 80% of training time here.