// multi-utility computation suite · offline · instant · precise
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health.target-heart-rate Calculator
Calculates the five heart-rate training zones from maximum HR and resting HR using the Karvonen formula (heart rate reserve method). Zone 2 training (60–70% HRR) builds aerobic base; zone 5 (>90% HRR) builds top-end speed — each zone stimulates different adaptations.
Inputs
Age
Age in completed years. Many health and fitness formulas adjust for age.
Rest Hr
Reference formula or conversion factor shown for context.
Intensity
Reference formula or conversion factor shown for context.
Results
max HR
Reference formula or conversion factor shown for context.
target HR
Reference formula or conversion factor shown for context.