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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.
What is normal blood pressure? An optimal blood pressure level is a reading under 120/80 mmHg. Readings over 120/80mmHg and up to 139/89mmHg are in the normal to high range. Your doctor will advise what your ideal blood pressure should be based on your circumstances. What is high blood pressure? Blood pressure over 140/90mmHg is generally considered to be high. When your blood pressure is high your heart and arteries can become overloaded.