Calculate your personalized heart rate training zones to optimize your workouts. Choose between different methods: use a known Maximum Heart Rate (MHR) for precision, or use age-based formulas (like the classic 220-age or the more modern Tanaka formula) if your MHR is unknown. The tool breaks down your heart rate into 5 distinct zones, from very light activity to maximum effort, helping you target specific fitness goals like fat burning, endurance, or peak performance.