Calculates target heart rate training zones based on age and max HR.
The heart rate training zone calculator finds your five training zones (easy through maximum effort) as percentages of your maximum heart rate.
Max HR (estimate) = 220 − age (Haskell-Fox formula) Zone 1 (recovery): 50–60% of max HR Zone 2 (fat-burning / base): 60–70% Zone 3 (aerobic / tempo): 70–80% Zone 4 (threshold): 80–90% Zone 5 (max / VO2 max): 90–100%
Age 35. Max HR ≈ 185 bpm. Zone 2: 111–130 bpm. Zone 4: 148–167 bpm. Zone 5: 167–185 bpm.
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