President Fords historic trip and fall down the steps of Air Force One. 1  People & Blogs. 2  Standard YouTube License.
The bottom number, called the diastolic pressure, is the measurement as the heart relaxes between beats. Normal blood pressure is a systolic pressure of less than 120 millimeters of mercury (mm Hg) and a diastolic pressure of less than 80 mm Hg, or 120/80 mm Hg, according to the American Heart Association (AHA). Having a blood pressure greater than 140/90 mm Hg is considered high blood pressure or hypertension. A blood pressure level between normal and hypertension, is called prehypertension, meaning it is higher than normal, but not high enough to be considered hypertension.
1 Normal blood pressure is when your blood pressure is 120/80 mmHg or lower most of the time. 2  High blood pressure (hypertension) is when your blood pressure is 140/90 mmHg most of the time.  If your blood pressure numbers fall between 120/80 and 140/90, it is called pre-hypertension.