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2. The Karvonen Formula is one of the most effective ways to estimate your target heart rate, because it takes your Resting Heart Rate (a good indicator of your fitness level) into account. Because it’s slightly more involved than other formulas (see #1 above), it isn’t used quite as often. But our Target Heart Rate calculator uses this formula and does all the work for you! You can see the details of this formula below, or simply use our calculator to find your target heart rate.
How to Use the Karvonen Formula:
Calculate your Max Heart Rate: (MHR = 220-age)
Find your Resting Heart Rate (RHR). Prior to getting out of bed in the morning, take your pulse on your wrist (radial pulse) or on the side of your neck (carotid pulse) for one full minute. This is your true resting heart rate. Measuring at other times of day, even at rest, does not yield the same results. To help assure accuracy, take your resting heart rate three mornings in a row and average the 3 heart rates together.
Plug your numbers into the formula, using percentages that reflect your fitness level (i.e. 50% to 60% for beginners and 75% to 85% for advanced), as indicated below: