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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.
As you might expect, a good blood pressure reading is one that is neither too high nor too low. In most cases, a reading under 120/80 is considered healthy. Because blood pressure can vary throughout the day, it's best to use the average of more than one reading when deciding if your blood pressure is good or not.