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Heart Rate Zone Calculator (Karvonen)

See your 5 training zones from resting HR and HRmax.

Karvonen training zones

Z1 (Recovery)125-138 bpm · 50-60% HRR
Z2 (Endurance)138-151 bpm · 60-70% HRR
Z3 (Tempo)151-164 bpm · 70-80% HRR
Z4 (Threshold)164-177 bpm · 80-90% HRR
Z5 (VO2 Max)177-190 bpm · 90-100% HRR

About this tool

Type age, resting HR, and HRmax to get the 5 Karvonen training zones (Z1 recovery → Z5 max), each shown as a bpm range and % of HRR. The r/running and r/cycling classic.

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