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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.
Your blood pressure consists of two numbers: The top or higher number is called the systolic number (pressure in vessels when your heart is beating), and the bottom or lower number is your diastolic number (pressure in your vessels when your heart is at rest). Here are the numbers you need to know: Optimal blood pressure: 115/75