Estimates maximum heart rate based on age.
The heart rate calculator estimates your maximum heart rate and defines five training zones using the Karvonen (heart rate reserve) method for more personalised targets.
Max HR = 220 − Age HR Reserve (HRR) = Max HR − Resting HR Target HR zone = Resting HR + HRR × (intensity%) Zones: Z1 50–60%, Z2 60–70%, Z3 70–80%, Z4 80–90%, Z5 90–100%
35-year-old, resting HR 60 bpm. Max HR = 185. HRR = 125. Zone 3 (70–80%): 60 + 125×0.70 = 147 to 60 + 125×0.80 = 160 bpm.
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