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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.
For a normal reading, your blood pressure needs to show a top number (systolic pressure) thatâs between 90 and 120 and a bottom number (diastolic pressure) thatâs between 60 and 80. The American Heart Association (AHA) considers blood pressure to be within the normal range when both your systolic and diastolic numbers are in these ranges.