There are different ways to calculate your target heart rate zone, but the Karvonen Method is one of the most effective because it factors in your resting heart rate. Here's how to calculate your target heart rate zone using the Karvonen Method.
- Measure your resting heart rate when you first wake up. You can do this by taking your pulse for one minute while still in bed. To take your pulse, place two fingertips (not a thumb) on either the radial (on your wrist, at the base of your thumb) or carotid (neck, next to your larynx) pulse site. Take your pulse for three mornings and then average those three readings to get your average resting heart rate. Add the three readings together, and divide that number by three to get your resting heart rate, like this:
(72 + 76 + 74) / 3= 74
- Next, determine your maximum heart rate. A simple formula to get your maximum heart rate is to subtract your age from 220. This is your maximum heart rate. For example, the maximum heart rate for a 34-year-old would be:
220 - 34 = 186
- Then, use this formula to determine your target heart rate:
Target Heart Rate = [(Maximum Heart Rate – Resting Heart Rate) × %Intensity] + Resting Heart Rate
So, using the example above, here's how to calculate the target heart zone for a 34-year-old who has a Maximum Heart Rate of 186 and a Resting Heart Rate of 74:
For a 50% Target Heart Rate: [(186 − 74) × 0.50] + 74 = 130 bpm
For a 85% Target Heart Rate: [(186 − 74) × 0.85] + 74 = 169 bpm
So the target rate heart zone would be 130-169 bpm.
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