Monitoring your exercise intensity is the best way to get the most out of your workouts. The target heart rate calculator below is one way to make sure you’re working within your target heart rate zone, the most effective zone for improving your fitness and burning calories. You can use a heart rate monitor to track your heart rate during your workouts. If you don’t have a heart rate monitor, take your pulse for 6 seconds, count how many times your heart beats and add a zero to get an estimate.