Normal blood pressure for an adult male regardless of age and weight is less than 120/80, according to the National Heart, Lung, and Blood Institute. A higher reading of one or both numbers indicates prehypertension or high blood pressure.
Blood pressure is measured as systolic and diastolic pressure, as the NHBLI explains. The top, or systolic, number is the reading when the heart is beating and pumping blood. The bottom, or diastolic, number represents the reading when the heart rests between beats. Knowing one's own blood pressure numbers is important because high blood pressure usually has no signs or symptoms. If left untreated, high blood pressure can damage the heart, blood vessels, kidneys and other parts of the body.