The Heart Health Calculator contains equations which give you indications of heart health and define ranges for target heart rate.
Usage:
Here is how to measure your heart rate:
Right after you stop exercising, take your pulse: Place the tips of your first two fingers lightly over one of the blood vessels on your neck, just to the left or right of your Adam's apple. Or try the pulse spot inside your wrist just below the base of your thumb.
original author: Carol