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Once you have your average blood pressure, the next step is to see where the numbers fall. Generally, anything under 120/80 is considered a good blood pressure. Average numbers between 120/80 and 139/89 are considered prehypertension.. If the average of your numbers is more than 140/90, you have high blood pressure.
Report Abuse. Normal systolic pressure (the top number) is 120-140. Typical diastolic pressure (the bottom number) is 60-90. You have to check your blood pressure with your arm at heart level to get an accurate reading.ypical diastolic pressure (the bottom number) is 60-90. You have to check your blood pressure with your arm at heart level to get an accurate reading.