Enter your age into the calculator to estimate your anaerobic threshold heart rate in beats per minute (BPM).

Anaerobic Threshold Formula

The following formula is used to estimate an anaerobic threshold.

AT = (220-A) * .875

  • Where AT is the anaerobic thershold (BPM)
  • A is the persons age (years)

What is an anaerobic threshold?


An anaerobic threshold is defined as the point at which the human body switches from aerobic to anaerobic metabolism.

The threshold is reached when a person’s heart rate reaches 85-90% of their maximum heart rate.

How to calculate anaerobic threshold?

Example Problem:

The following example outlines how to calculate an anaerobic threshold.

First, determine the age of the person being analyzed. In this case, the person is 40 years old.

Next, estimate their maximum heart rate. This is done by subtracting their age from 220.

MHR = 220-40

MHR = 180 BPM

Finally, calculate the anaerobic threshold using the formula above:

AT = (220-A) * .875

AT = (180) * .875

AT = 157.5 BPM