HeartCalc overcomes the problem that most exercise programs have in that they express the intensity of exercise as a percentage of maximum heart rate, while most heart-rate monitors must be programmed as an absolute number of heart beats per second, based on the user s resting and maximum heart rates. Heart Calc uses the Karvonen method of calculation, based on an effective heart-rate range (from resting to maximum heart rate). Simply enter your maximum and resting heart rates, then the percentage limits of the exercise band you wish to train in. A simple Click of the Calculate button will produce the limits to which you should set your heart-rate monitor.