This iPhone web app calculator uses a more accurate formula for MHR than the traditional 220-age approach, but you can choose the traditional formula if you want to. Estimate your target heart rate zone using the popular Karvonen Formula. This formula uses both your resting heart rate (RHR) and maximum heart rate (MHR) to calculate a target heart rate (THR) zone for exercise and training. Try with TestiPhone
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Cool app.. I used this, and plugged the zones into my Polar HRM and I’m good to go…thanks!Posted on November 14th, 2008 at 6:28 am by Jay