Normal blood pressure for adults is below 120/80 mm Hg. That means the top number (systolic) stays under 120 and the bottom number (diastolic) stays under 80. This threshold was reaffirmed in the 2025 joint guidelines from the American Heart Association and American College of Cardiology, and it applies to all adults regardless of age.
What the Two Numbers Mean
The top number, systolic pressure, measures the force your blood exerts on artery walls when your heart beats. The bottom number, diastolic pressure, measures that force between beats, when your heart is resting. Both numbers matter, but systolic pressure tends to rise with age and becomes the more important predictor of heart disease in people over 50.
A reading of 115/75 is normal. So is 105/68. There’s no single “ideal” number within the normal range. What matters is staying below the 120/80 threshold and, just as importantly, not dropping so low that you feel symptoms like dizziness or fainting.
Blood Pressure Categories for Adults
- Normal: below 120 systolic and below 80 diastolic
- Elevated: 120 to 129 systolic with diastolic still below 80
- Stage 1 hypertension: 130 to 139 systolic, or 80 to 89 diastolic
- Stage 2 hypertension: 140 or higher systolic, or 90 or higher diastolic
- Severe hypertension: above 180 systolic and/or above 120 diastolic
Notice the word “or” starting at Stage 1. Only one number needs to be elevated for the reading to count as high blood pressure. A reading of 135/72 qualifies as Stage 1 hypertension even though the bottom number looks fine.
The “elevated” category is a warning zone. It means your blood pressure isn’t high enough to be called hypertension yet, but it’s trending in the wrong direction. People in this range typically benefit from lifestyle changes like reducing sodium, exercising more, and managing stress, rather than medication.
When Blood Pressure Is Too Low
Low blood pressure is generally defined as a reading below 90/60 mm Hg. But unlike high blood pressure, a low number isn’t automatically a problem. If you consistently read 88/58 and feel perfectly fine, that’s your normal. Many athletes and younger adults run low without any issues.
Low blood pressure only becomes a concern when it causes symptoms. A sudden drop of just 20 points in your systolic number, say from 110 down to 90, can make you dizzy or lightheaded, especially when standing up quickly. If low readings come with dizziness, blurred vision, nausea, or fainting, that’s worth investigating.
Blood Pressure Targets for Older Adults
The normal threshold of under 120/80 doesn’t change with age, but treatment targets for older adults are more nuanced. A major NIH-funded trial called SPRINT found that lowering systolic pressure to below 120 in adults age 50 and older significantly reduced the risk of cardiovascular disease and death. That finding pushed guidelines toward more aggressive treatment in older populations.
In practice, though, doctors weigh a person’s overall health, frailty, medication burden, and fall risk before setting a target. Someone who is 80 and relatively healthy may aim for the same target as a 55-year-old, while someone who is frail or managing multiple conditions may have a more relaxed goal. There’s no single cutoff where age alone changes the definition of “normal.”
Blood Pressure During Pregnancy
Normal blood pressure during pregnancy is the same as for other adults: below 120/80 mm Hg. But pregnancy adds unique risks. Blood pressure at or above 140/90 typically prompts a doctor to recommend treatment, and readings of 160/110 or higher are classified as severe hypertension, which requires urgent attention because of the risk of preeclampsia and other complications.
Blood pressure naturally fluctuates during pregnancy, often dipping in the second trimester before rising again in the third. Regular monitoring matters more during this period than at almost any other time.
How Blood Pressure Works in Children
Children don’t use the same fixed numbers as adults. A normal reading for a child depends on age, sex, and height. Doctors compare a child’s blood pressure against percentile charts from the National Heart, Lung, and Blood Institute. A reading at or below the 90th percentile for a child’s age, sex, and height is considered normal. Above the 95th percentile is considered hypertension.
This means a reading of 110/70 could be perfectly normal for a tall 12-year-old but elevated for a small 6-year-old. Your pediatrician uses growth charts to interpret the numbers in context.
How to Get an Accurate Reading
Blood pressure is surprisingly easy to measure wrong. Small errors in technique can shift your reading by 10 to 15 points, enough to push a normal result into the elevated range or mask a genuinely high one. The American Heart Association’s measurement guidelines are specific about what accuracy requires.
Sit quietly for three to five minutes before taking a reading. Don’t talk or move around during this rest period. Your feet should be flat on the floor, legs uncrossed, and back supported. Place the cuff on bare skin (rolling up a tight sleeve can act like a tourniquet and distort results). The middle of the cuff should sit at heart level, roughly at the midpoint of your chest. If your arm is resting on a table, that typically puts it at the right height. The bottom edge of the cuff should sit about two to three centimeters above the crease of your elbow.
Cuff size matters too. A cuff that’s too small will give you a falsely high reading. If you have larger arms and your home monitor came with a standard cuff, it’s worth buying the correct size separately.
Why Your Readings Vary
If your blood pressure reads 118/76 at home but 138/86 at the doctor’s office, you may have what’s called white coat hypertension, where the stress of a medical visit temporarily raises your numbers. This is common, affecting roughly 15 to 25 percent of people who get high readings in clinical settings.
The reverse also happens. Masked hypertension means your readings look normal in the office but run high at home or during daily life. Studies across multiple continents have found masked hypertension in about 10 to 20 percent of people with normal office readings. This pattern is actually more dangerous than white coat hypertension because it can go undetected for years.
Home monitoring over several days gives a more reliable picture than any single reading. If you’re tracking at home, take two or three readings each time, spaced a minute apart, and record all of them rather than just the lowest one. Morning readings before coffee or exercise tend to be the most consistent baseline.
What Counts as a Medical Emergency
A reading above 180/120 with symptoms is a hypertensive emergency. Symptoms include severe headache, chest pain, vision changes (blurriness, eye pain, or sudden vision loss), confusion, difficulty speaking, sudden weakness on one side of the body, or seizures. If you see a number that high and have any of these symptoms, call 911. This is one of the few blood pressure situations where minutes matter.
A reading above 180/120 without symptoms is still serious, classified as severe hypertension in the 2025 guidelines. It calls for prompt medical evaluation, but not necessarily an ambulance. Contact your doctor or an urgent care provider that same day.