Blood Pressure

Level	Systolic	Diastolic
Optimal	- 120	- 80
Normal	- 130	- 85
Pre Hypertension	- 140	- 90
Hypertension Stage 1 Moderate	- 160	- 100
Hypertension Stage 2 High	- 180	- 110
Hypertention Stage 3 Severe	180 +	110 +

Blood Pressure Classification Chart (Adults)
Category	Systolic pressure (mm Hg)	Diastolic pressure (mm Hg)
Optimal	Less than 120	Less than 80
Normal	Less than 130	Less than 85
High-normal	Less than 140	Less than 90
Mild Hypertension	Less than 160	Less than 100
Moderate Hypertension	Less than 180	Less than 110
Severe Hypertension	180 or more	110 or more

Diastolic pressure (the lower reading) is the pressure remaining in the blood vessels when the heart is at rest between beats and the blood vessels are relaxed.

Systolioc pressure (the higher reading) is the pressure at which blood can just pass the obstruction of the cuff. Loosely speaking it is a measure of how hard the heart can pump.