Free Target Heart Rate & Training Zones Calculator (Karvonen) Online
Calculate training heart rate zones (Zone 1 Active Recovery to Zone 5 VO2 Max) using the Karvonen formula and resting pulse. — 100% free online utility, zero sign-up, zero paywalls, and private client-side processing.
How It Works
Enter Age
Input your current age to establish estimated Max Heart Rate (220 - age).
Enter Resting Heart Rate
Input resting morning pulse (e.g., 60 bpm).
Calculate Heart Rate Reserve (HRR)
Computes HRR = Max HR - Resting HR.
Review 5 Intensity Zones
View target beats-per-minute for Zone 2 Endurance, Zone 3 Tempo, and Zone 4 Threshold.
Frequently Asked Questions
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