A good blood pressure reading is below 120/80 mmHg. That’s the threshold the American Heart Association and American College of Cardiology use to define “normal” in their 2025 guidelines. Once your top number hits 120 or your bottom number reaches 80, you’ve moved into a higher category that carries more cardiovascular risk.
What the Two Numbers Mean
Blood pressure is always expressed as two numbers. The top number (systolic) measures the force of blood pushing against your artery walls when your heart beats. The bottom number (diastolic) measures that same pressure between beats, when the heart is relaxed and refilling with blood. Both matter, and if they fall into different categories, the higher category is the one that counts.
Blood Pressure Categories for Adults
The current guidelines break adult blood pressure into four categories:
- Normal: Below 120 systolic and below 80 diastolic
- Elevated: 120 to 129 systolic with a 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
“Elevated” blood pressure is a warning zone. You don’t have hypertension yet, but without changes, you’re likely heading there. Stage 1 and Stage 2 hypertension both increase your risk of heart attack, stroke, kidney damage, and cognitive decline over time.
When Blood Pressure Is Too Low
Lower isn’t always better. A reading below 90/60 mmHg is considered low blood pressure, or hypotension. Some people run naturally low without any problems, but if you’re experiencing dizziness, lightheadedness, blurred vision, fatigue, nausea, or fainting, that low number is likely causing symptoms. Sudden drops in blood pressure can also cause confusion or unusual changes in behavior.
Blood Pressure Targets for Older Adults
The standard categories apply regardless of age, but blood pressure management in older adults involves trade-offs. Research consistently shows that getting systolic pressure below 130 mmHg benefits ambulatory, noninstitutionalized older adults. However, pushing blood pressure lower in older people who have other health conditions raises the risk of side effects like fainting, electrolyte imbalances, and kidney problems. The ideal target depends on overall health, not just age.
How Children’s Blood Pressure Is Measured
Children’s blood pressure doesn’t follow the same fixed numbers. For kids ages 1 through 12, a “normal” reading depends on their age, sex, and height. Pediatricians use percentile charts: anything below the 90th percentile for their demographic group is considered normal. Above the 90th percentile is elevated, and above the 95th percentile enters hypertension territory.
Starting at age 13, kids are evaluated using the same thresholds as adults: below 120/80 is normal, 120 to 129 systolic is elevated, and 130/80 or higher is stage 1 hypertension.
What Happens When Blood Pressure Stays High
Persistently high blood pressure damages your body quietly, often for years before you notice anything. The constant extra force wears on the inner lining of your arteries, making them stiffer and narrower. That restricted blood flow affects every organ. Your heart has to work harder, which can thicken the heart muscle and eventually lead to heart failure. Weakened artery walls can bulge into aneurysms, which are life-threatening if they rupture.
The kidneys are especially vulnerable because they filter blood through a dense network of tiny vessels. High pressure damages those vessels and gradually reduces kidney function. In the brain, reduced blood flow can cause a type of dementia called vascular dementia and contributes to mild cognitive impairment, the kind of memory and thinking problems that fall short of full dementia but still affect daily life.
How Much Lifestyle Changes Can Lower Your Numbers
If your blood pressure is in the elevated or stage 1 range, lifestyle changes alone can sometimes bring it back to normal. The reductions are real and measurable.
Diet makes the biggest single difference. Eating a pattern rich in whole grains, fruits, vegetables, and low-fat dairy while cutting back on saturated fat can lower systolic blood pressure by up to 11 mmHg. That’s comparable to what some medications achieve. Reducing sodium to 1,500 mg per day or less drops blood pressure by about 5 to 6 mmHg. Regular aerobic exercise, things like brisk walking, cycling, or swimming, lowers it by another 5 to 8 mmHg.
These effects add up. Someone who combines all three changes could potentially see a 15 to 20+ mmHg reduction in systolic pressure, which is enough to move from stage 1 hypertension back into normal range for many people.
How to Get an Accurate Reading at Home
A single reading in a doctor’s office isn’t the most reliable picture of your blood pressure. Home monitoring gives you a better average over time. The AHA recommends an automatic, cuff-style monitor that wraps around your upper arm (not wrist monitors, which are less accurate).
The details of how you take the reading matter more than most people realize. Avoid caffeine, smoking, and exercise for at least 30 minutes beforehand, and empty your bladder first. Sit quietly for five full minutes before measuring. Don’t talk or check your phone during the rest period or the reading itself.
Place the cuff on bare skin, not over clothing. The bottom edge should sit just above the bend of your elbow, with the middle of the cuff at heart level. Rest your arm on a flat surface, using a pillow to prop it up if needed so it stays level with your heart. Small positioning errors can skew readings by several points in either direction, which is enough to push you into a different category entirely.