When is your blood pressure considered high?

Hypertension, or high blood pressure, is defined as a systolic blood pressure (the top number) of 130 mmHg or higher, or a diastolic blood pressure (the bottom number) of 80 mmHg or higher. For adults, a normal blood pressure reading is considered to be below 120/80 mm Hg. A reading of 130/80 mm Hg or higher means your blood pressure is high.