The Target Heart Rate (THR), or Training Heart Rate, is a desired range of heart rate reached during aerobic exercise which enables one’s heart and lungs to receive the most benefit from a workout. Use our target heart rate calculator to calculate your target heart rate zone to exercise safely. Knowing your target heart rate will let you measure your initial fitness level and monitor your progress in a fitness program. This method requires measuring your pulse periodically as you exercise and staying within your target heart rate zone. Our calculator will quickly and easily calculate the ideal training heart rate range to maximize your cardiovascular fitness.