Zone 2 Calculator

Zone 2 Calculator

Estimate your Zone 2 heart rate range using the Karvonen formula.

Age (years)

Please enter a valid age (1-120).

Resting Heart Rate (bpm)

Please enter a valid resting heart rate (30-150 bpm).

Your Zone 2 Heart Rate Range

Lower Limit

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Upper Limit

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Formula Used: Karvonen Formula
Target HR = ((Max HR - Resting HR) × Intensity%) + Resting HR
Max HR = 220 - Age
Zone 2: 60% to 70% of Heart Rate Reserve