Blood pressure level (mm Hg)
Category Systolic
as the heart beats
Diastolic
as the heart relaxes between beats
Normal < 120 < 80
Prehypertension 120–139 80–89
blood pressure measurement of 120/80 mm Hg (millimeters of mercury) = (120 over 80)
High blood pressure
Stage 1 hypertension 140–159 90–99
Stage 2 hypertension >=160 >=100