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Blood Pressure Categoryīlood pressure chart source: American Heart Association

With these examples, blood pressure is written as 130/85 mm Hg (millimeters of mercury) and is said to be “130 over 85.” Blood pressure chart: What’s normal blood pressure and high blood pressure?īlood pressure readings fall into five categories, ranging from normal to extremely high (called “hypertensive crisis”), according to the American Heart Association. This is the “bottom” number and is a measure of the pressure in your arteries when your heart is relaxing between beats. This is the “top” number and is a measure of the pressure in your arteries when your heart beats.