Heart Rate
Heart Rate Zone Calculator
Power shows the work. Heart rate shows the cost. Calculate your 5 HR zones for smarter training.
Zone Breakdown
Z1
Recovery
50–60% Max HR
Active recovery, warm-up and cool-down
Z2
Endurance
60–70% Max HR
Aerobic base building, fat burning
Z3
Tempo
70–80% Max HR
Comfortably hard, muscular endurance
Z4
Threshold
80–90% Max HR
Sustained hard efforts, lactate threshold
Z5
Max
90–100% Max HR
VO2 max intervals, all-out efforts