A good blood pressure reading is below 120/80 mmHg. That target applies to all adults regardless of age, according to the 2025 guidelines from the American Heart Association and American College of Cardiology. If your reading lands under those two numbers, your blood pressure is considered normal.
What the Two Numbers Mean
A blood pressure reading has two parts. The top number (systolic) measures the pressure inside your arteries when your heart beats and pushes blood out. The bottom number (diastolic) measures the pressure when your heart relaxes and refills between beats. Your heart spends about one-third of its time contracting and two-thirds resting, so the diastolic number is almost always lower.
Both numbers matter. A high systolic reading increases your risk of heart disease, stroke, and kidney disease just as much as a high diastolic reading does, sometimes more.
Blood Pressure Categories for Adults
Your reading falls into one of five categories:
- Normal: below 120 systolic and below 80 diastolic
- Elevated: 120 to 129 systolic and below 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
- Hypertensive crisis: above 180 systolic or above 120 diastolic
Notice that only one number needs to be high for a diagnosis. If your systolic is 145 but your diastolic is 78, that still qualifies as Stage 2 hypertension.
Why the Threshold Changed
Before 2017, high blood pressure was defined as 140/90 or above for most adults, and 150/80 for people 65 and older. The guidelines were lowered to 130/80 for everyone after a large trial showed that treating blood pressure more aggressively reduced heart attacks and strokes across all age groups. The current 2025 guidelines kept those same thresholds, and they no longer make separate recommendations for older adults.
This means many people who were once told their blood pressure was fine now fall into the elevated or Stage 1 category. A reading of 135/85, for example, would have been considered acceptable a decade ago. Today it’s classified as Stage 1 hypertension.
When Blood Pressure Is Too Low
A reading below 90/60 is generally considered low blood pressure (hypotension). Unlike high blood pressure, low blood pressure is only a concern if it causes symptoms: dizziness, fainting, blurred vision, or feeling lightheaded when you stand up. Some people naturally run on the lower side and feel perfectly fine. If that’s you, there’s nothing to worry about.
Blood Pressure in Children
There’s no single “good” number for kids. Normal blood pressure in children depends on age, sex, and height, and is measured against percentiles rather than fixed cutoffs. A reading that’s normal for a 12-year-old might be high for a 6-year-old. Pediatricians use standardized charts to determine where a child’s reading falls relative to other children of the same size and age.
What a Hypertensive Crisis Looks Like
A reading above 180/120 is a hypertensive crisis. This can happen with or without symptoms. If you see numbers that high and have chest pain, shortness of breath, vision changes, difficulty speaking, or severe headache, that’s a medical emergency. If you have no symptoms, wait five minutes and measure again. A single high reading can be caused by stress, caffeine, or a full bladder, but consistently elevated readings at that level need prompt attention.
How Much Lifestyle Changes Actually Move the Numbers
Cutting back on salt is one of the most studied ways to lower blood pressure without medication. A modest reduction in salt intake, sustained for at least four weeks, lowers systolic pressure by about 4 mmHg and diastolic by about 2 mmHg on average. The effect is bigger if you already have high blood pressure: roughly a 5 mmHg drop in systolic and nearly 3 mmHg in diastolic. Even people with normal blood pressure see a smaller but measurable benefit, around 2.4 mmHg systolic.
Those numbers may sound small, but they add up. Reducing your daily salt intake by about 6 grams (roughly a teaspoon) is associated with a systolic drop of nearly 6 mmHg. For someone sitting at 135 systolic, that single change could bring them close to the normal range. Combined with regular exercise, maintaining a healthy weight, and limiting alcohol, the cumulative effect on blood pressure can rival what some medications achieve.
How to Get an Accurate Reading
Blood pressure fluctuates throughout the day. It rises when you’re stressed, after coffee, during exercise, and even during conversation. To get a reliable number, sit quietly for five minutes before measuring. Keep your feet flat on the floor, your back supported, and the cuff on bare skin at heart level. Don’t measure right after eating, exercising, or smoking.
A single reading doesn’t tell you much. Blood pressure is diagnosed based on an average of multiple readings taken on different days. If you’re monitoring at home, take two readings in the morning and two in the evening for at least three days, then average them. That average is a far better picture of your cardiovascular health than any single number on a pharmacy machine.