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Heart Rate Zones
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Max Heart Rate
—
bpm
Enter age to begin
Fat Burn (50–60%)
—
Cardio (70–80%)
—
Peak (85–95%)
—
Max HR
—
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Your Details
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Age (years)
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Resting HR (bpm)
(optional)
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How zones work
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Max HR
— Estimated as 220 − age (simple & widely used).
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Karvonen
— If you enter resting HR, zones use heart-rate reserve for better accuracy.
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Zones
— Fat burn (easy), Cardio (endurance), Peak (hard intervals).
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