Free Zone 2 Training Tools
Science-backed training calculators to optimize your endurance and fat burning. No downloads, no signup.
Heart Rate Zone Calculator — Zone 2, Karvonen, MAF & Fat Burning
Calculate all 5 heart rate training zones, find your optimal Zone 2 range, compare Karvonen and MAF methods, and see exactly how much fat you burn at each intensity level.
More tools coming soon: VO2 Max Estimator, Training Plan Builder.