Fitness
Heart Rate Zone Calculator
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Heart Rate Zone Calculator
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1RM Calculator
Heart rate reserve
Max HR
Age
Resting HR
bpm
Max heart rate
Estimate by age
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For training reference only. If you have conditions, medication, pain, or dizziness, follow professional guidance first.
Training zones
135-148
Z2 · Endurance · bpm
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Estimated max HR
185
Heart rate reserve
125
Zone
Intensity
Range
Z1
Easy recovery
50-60%
123-135
Z2
Endurance
60-70%
135-148
Z3
Aerobic
70-80%
148-160
Z4
Threshold
80-90%
160-173
Z5
High intensity
90-100%
173-185