But, for exercisers, the typical way we calculate MHR is with the formula 220-age. This formula is a bit controversial because it doesn't reflect the differences in heart rate according to age. A more accurate formula, offered in a study published in the journal, Medicine & Science in Sports & Exercise, is 206.9 - (0.67 x age).
Find out more about how to use your MHR to calculate your heart rate zones in these resources:
Sources
Jackson, Andrew S. Estimating Maximum Heart Rate From Age: Is It a Linear Relationship? Med Sci Sports Exerc. 39(5):821, May 2007.

