How to Calculate a Correct MHR

Your maximum heart rate (MHR) is about 220 minus your age. This is the approximate limit of your cardiovascular system. According to the Mayo Clinic, the target heart rate for a vigorous workout is between 70 and 85 percent of your maximum heart rate, although they also state that there is no definitive consensus as to maximum heart rate or target rate for workouts. Ideally, you should determine your target heart rate in consultation with a health professional. Once you know your target, you can track your heart rate while exercising with a heart rate monitor.

Things You'll Need

  • Calculator
  • Heart rate monitor
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Instructions

    • 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.