A healthy blood pressure reading is less than 120/80 mm Hg. That’s the target for most adults, and it applies whether you’re checking at home or getting a reading at the doctor’s office. Once either number climbs above that threshold, your cardiovascular risk starts to increase, even if you feel perfectly fine.
What the Two Numbers Mean
A blood pressure reading gives you two numbers. The top number (systolic) measures the force of blood pushing against your artery walls each time your heart beats. The bottom number (diastolic) measures that same pressure between beats, when your heart is resting. Both matter, but for adults over 50, the top number is a stronger predictor of heart disease risk.
You’ll see readings written as one number over the other, like 118/76. The unit is millimeters of mercury (mm Hg), a holdover from the original pressure gauges used in medicine. What matters to you isn’t the unit but where your numbers fall in the categories below.
Blood Pressure Categories for Adults
The American Heart Association and the American College of Cardiology define four ranges:
- Normal: less than 120 systolic and less than 80 diastolic
- Elevated: 120 to 129 systolic and less than 80 diastolic
- Stage 1 hypertension: 130 to 139 systolic or 80 to 89 diastolic
- Stage 2 hypertension: 140 or higher systolic or 90 or higher diastolic
Notice the word “or” in the hypertension categories. If just one of your numbers crosses the line, that’s enough to put you in a higher category. You don’t need both numbers to be elevated. Someone with a reading of 142/78 is in Stage 2 hypertension territory even though the bottom number looks fine.
Elevated blood pressure (that 120 to 129 range) doesn’t mean you have hypertension yet, but it’s a signal that your numbers are trending in the wrong direction. Without changes, most people in this range will eventually cross into Stage 1.
Targets for Older Adults
For a long time, many doctors accepted higher blood pressure in older patients, reasoning that arteries stiffen naturally with age. That thinking has shifted. A large NIH-funded study 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 said, the right target for any individual over 65 depends on the full picture: other health conditions, medications, fall risk, and overall fitness. Some older adults experience dizziness or lightheadedness when blood pressure drops too aggressively, which can lead to falls. The general goal remains below 120/80, but your doctor may adjust that target based on how you tolerate treatment.
Blood Pressure in Children
There’s no single “normal” number for kids the way there is for adults. In children and adolescents, healthy blood pressure is defined by percentiles that account for age, sex, and height. A child’s reading is compared against a large reference population of similar kids. Blood pressure at or above the 95th percentile for their age, sex, and height group is considered high. If your child’s pediatrician flags a blood pressure concern, it means their numbers are consistently higher than what’s expected for kids of the same size and age.
Special Targets During Pregnancy
Pregnancy changes the equation. High blood pressure during pregnancy is defined as a reading of 140/90 or higher, confirmed on two separate readings at least four hours apart. That’s a higher threshold than the 130/80 cutoff used for general hypertension, reflecting the unique physiology of pregnancy.
Gestational hypertension refers to high blood pressure that develops during pregnancy in someone who previously had normal readings. Preeclampsia is a more serious condition that combines high blood pressure with signs of organ stress, typically after 20 weeks of pregnancy. Severe high blood pressure during pregnancy, defined as 160/110 or higher on two or more occasions, requires urgent medical attention because of the risk to both mother and baby.
When Kidney Disease or Diabetes Changes the Goal
If you have chronic kidney disease, the recommended systolic target is below 120, based on findings from the SPRINT trial. The logic is straightforward: high blood pressure damages the tiny blood vessels in the kidneys, and tighter control slows that damage. For people who also have diabetes alongside kidney disease, the ideal target is less clearly defined because those specific subgroups weren’t well represented in the major clinical trials. Your care team will likely aim for something close to 120 systolic while watching for side effects.
How to Get an Accurate Reading
Blood pressure fluctuates throughout the day. A single reading can be thrown off by rushing into the appointment, talking during the measurement, or even sitting with your legs crossed. To get a number you can trust, follow these steps:
- Sit quietly for at least 5 minutes in a comfortable chair with your back supported before taking a reading.
- Keep both feet flat on the floor with your legs uncrossed.
- Rest your arm on a table at chest height with the cuff against bare skin, not over clothing.
- Use the right cuff size. A cuff that’s too small will give artificially high readings.
If you’re monitoring at home, take two or three readings a minute apart and record all of them. A single reading is just a snapshot. Patterns over days and weeks tell you far more than any one number.
Home Readings vs. Office Readings
Your blood pressure at the doctor’s office may not match what you get at home, and the difference can be clinically significant. Some people run about 6 mm Hg higher systolic in the office than at home simply because of the stress of a medical visit. This is called white-coat hypertension: your numbers look high in the clinic but are normal the rest of the time.
The opposite pattern also exists. Masked hypertension means your readings look fine at the office but run high everywhere else. This is arguably more dangerous because it can go undetected for years. Home monitoring catches both of these patterns, which is why many doctors now recommend it as a routine part of blood pressure management rather than relying solely on the readings taken during appointments.
When a Reading Becomes an Emergency
A blood pressure reading of 180/120 or higher is considered a hypertensive crisis. If you see numbers this high at home and don’t have symptoms, sit quietly for a few minutes and recheck. Anxiety, rushing, or a poorly positioned cuff can occasionally cause a false spike.
If the reading stays at or above 180/120 and you’re experiencing chest pain, shortness of breath, blurred vision, confusion, or signs of a stroke (numbness or loss of feeling in the face, arm, or leg, especially on one side of the body), call 911 immediately. At these levels, blood pressure can damage organs within minutes.