As you can see from the blood pressure chart, only one of the numbers has to be higher or lower than it should be to count as either high blood pressure or low. Ideally, we should all have a blood pressure below over 80 (/80). This is the ideal blood pressure for people wishing to have good health. At this level. a blood pressure reading has a top number (systolic) and bottom number ( diastolic). People whose blood pressure is above the normal range should ask their.