Zone 2 Calculator

Optimize your aerobic base training
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Used to estimate max HR with formula: 220 - age
Used for estimation if Max HR is unknown.
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Override estimated max with your actual max HR
Enter if you know your true max.
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Measure when you wake up, before getting out of bed
Essential for Karvonen accuracy.
Your Zone 2 Target
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60-70% of heart rate reserve. Conversational pace.
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Maintain this heart rate to build mitochondrial efficiency and burn fat without accumulating fatigue.
Max HR
-- bpm
Resting HR
-- bpm
Reserve
-- bpm
Full Training Spectrum