A good blood pressure reading is below 120/80 mmHg. That’s the target the American Heart Association and American College of Cardiology recommend for most adults, and the 2025 updated guidelines reaffirm this goal while encouraging people to get as close to 120/80 as possible. Once your top number creeps above 120 or your bottom number rises above 80, your cardiovascular risk starts climbing.
What the Numbers Mean
A blood pressure reading gives you two numbers. The top number (systolic) measures the pressure in your arteries when your heart beats. The bottom number (diastolic) measures the pressure between beats, when your heart is resting. Both are measured in millimeters of mercury, written as mmHg.
The top number is the stronger predictor of future heart problems and death at any age. For people under 50, the bottom number adds useful information about risk, but systolic pressure remains the number to watch regardless of your age or sex.
Blood Pressure Categories
- Normal: Below 120/80 mmHg. This is the range you want to stay in.
- Elevated: 120 to 129 systolic with a diastolic still under 80. Not yet high blood pressure, but a warning sign that it’s heading that direction.
- Stage 1 hypertension: 130 to 139 systolic, or 80 to 89 diastolic. Lifestyle changes are typically recommended, and medication may be considered depending on your overall heart disease risk.
- Stage 2 hypertension: 140 or higher systolic, or 90 or higher diastolic. This usually calls for both lifestyle changes and medication.
- Low blood pressure (hypotension): Below 90/60 mmHg. Some people naturally run low without symptoms, but readings in this range can cause dizziness, fainting, or fatigue.
Only one of the two numbers needs to be out of range for a reading to fall into a higher category. If your top number is 135 but your bottom number is 75, that’s still stage 1 hypertension because of the systolic reading.
Why Staying Below 120/80 Matters
High blood pressure forces your heart to work harder with every beat. Over years, that extra strain weakens the heart muscle or makes it stiff, eventually leading to heart failure. It also damages blood vessels throughout your body, making them more likely to narrow, leak, or rupture. In the brain, this raises the risk of stroke by cutting off oxygen or causing bleeding. The kidneys, eyes, and arteries supplying your limbs are all vulnerable too.
A landmark clinical trial called SPRINT tested what happens when people aim for a top number below 120 instead of below 140. The group targeting the lower number had 25% fewer heart attacks, strokes, and cardiovascular deaths. Their overall death rate dropped as well, from 4.5% to 3.3%. That difference was significant enough that researchers stopped the trial early because the benefit was so clear.
Do Targets Change With Age?
The 2025 guidelines set the same general target of under 130/80 for most adults, with encouragement to reach under 120/80 when possible. Earlier guidelines had separate sections for older adults, different racial groups, and men versus women. The updated approach folds those factors into a broader assessment of your individual cardiovascular risk rather than setting different numbers based on demographics alone. Exceptions exist for people in institutional care, those with limited life expectancy, or people who are pregnant.
Getting an Accurate Reading
A single reading in a doctor’s office doesn’t always reflect your true blood pressure. Anxiety about the visit itself, sometimes called white coat syndrome, can temporarily push your numbers higher. Caffeine, nicotine, a full bladder, stress, dehydration, and even sudden pain can all cause short-term spikes that don’t represent your typical level.
To get a reliable number, the CDC recommends a specific routine. Don’t eat or drink anything for 30 minutes beforehand. Empty your bladder. Sit in a chair with your back supported for at least five minutes before the reading. Keep both feet flat on the floor with your legs uncrossed. Rest your arm on a table at chest height, and make sure the cuff sits against bare skin, not over a sleeve. Don’t talk while the measurement is being taken.
If you’re monitoring at home, take readings at the same time each day, ideally morning and evening. Two or three readings a minute apart give a more accurate picture than a single measurement. Track your results over a week or two before drawing conclusions about where you stand. A pattern of readings consistently below 120/80 is a much more meaningful sign of good blood pressure than any single number on its own.
What Pushes Blood Pressure Up
Some causes of high blood pressure are outside your control: genetics, age, and certain chronic conditions all play a role. But many of the most common drivers are things you can change. Excess sodium intake, low physical activity, carrying extra weight, heavy alcohol use, and chronic stress all contribute to readings that creep upward over time. Smoking and tobacco use narrow blood vessels directly, forcing the heart to pump harder.
The good news is that the same lifestyle changes that lower blood pressure also reduce heart disease risk in other ways. Regular aerobic exercise, cutting back on sodium, maintaining a healthy weight, limiting alcohol, and managing stress can each lower your top number by several points. Combined, those changes can be as effective as a single blood pressure medication for people in the elevated or stage 1 range.