Heart-rate zones (Karvonen)
Calculate your 5 Karvonen training heart-rate zones from age and resting heart rate.
Open calculatorMax heart rate (HRmax)
Compares the classic textbook formula (220 − age) with the Tanaka equation (208 − 0.7 × age), which tends to be more accurate for adults over 35.
Your age in years — used by both formulas.
Tanaka formula (208 − 0.7 × age)
184
Classic formula (220 − age)
185
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Age-based formulas are population averages and can differ from your true individual HRmax by ±10–15 bpm.
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Educational estimate only. Not medical, tax, legal or financial advice.