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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.
1 If your blood pressure is borderline high-systolic blood pressure between 120 and 139 or diastolic blood pressure between 80 and 89 - get it checked at least once a year, or more often as your doctor suggests. normal diastolic blood pressure number is 80 or less. A diastolic blood pressure between 80 and 89 is normal but higher than ideal. A diastolic blood pressure number of 90 or higher, on repeated measurements, is considered to be hypertension or high blood pressure.