how much does a normal heart weigh?
Two-thirds of the heart is located to the left of the midline of the body and 1/3 is to the right (see Figure 1). The apex (pointed end) points down and to the left. It is 5 inches (12 cm) long, 3.5 inches (8-9 cm) wide and 2.5 inches (6 cm) from front to back, and is roughly the size of your fist. The average weight of a female human heart is 9 ounces and a male's heart is 10.5 ounces. The heart comprises less than 0.5 percent of the total body weight. The heart has three layers. The smooth, inside lining of the heart is called the endocardium.