Normal blood pressure is below 120/80 mm Hg. If you’re an adult and your systolic pressure is 120 to 129, and your diastolic pressure is less than 80, you have elevated blood pressure. High blood pressure is a systolic pressure of 130 or higher,or a diastolic pressure of 80 or higher, that stays high over time.
From Top to Bottom. Fifty years ago, diastolic pressure—the bottom number in your blood pressure reading—was considered a primary measure of heart health. Over time, newer research revealed systolic pressure—the top number—as a better predictor of heart concerns.
The top number of your blood pressure reading tells you the force of the bloodagainst artery walls when your heart beats. It is called systolic pressure. The bottom number tells you what your blood pressure is when your heart is at rest between heartbeats. It is called diastolic pressure.
As a general guide: high blood pressure is considered to be 140/90mmHg or higher (or 150/90mmHg or higher if you’re over the age of 80) ideal blood pressure is usually considered to be between 90/60mmHg and 120/80mmHg.