How to Calculate a Correct MHR
- 1). Subtract your age in years from 220 to determine your maximum heart rate (MHR). For example, if you are 40 years old, your maximum heart rate is 180 beats per minute.
- 2). Multiply your maximum heart rate by .70. This is the low end of your target range while exercising.
- 3). Multiply your maximum heart rate by .85; this is the high end of your target range while exercising. In this example, for a person of 40 years old, the target heart rate during a vigorous workout is between 126 and 153 beats per minute.
- 4). Use your heart rate monitor to track your heart rate during exercise.