Good blood pressure is anything below 120/80 mmHg. That reading, confirmed by the latest 2025 guidelines from the American Heart Association and American College of Cardiology, remains the threshold separating normal from elevated. Once your numbers consistently reach 130/80 or higher, you’re in hypertension territory.
What the Two Numbers Mean
A blood pressure reading has two parts. The top number (systolic) is the peak pressure in your arteries when your heart contracts and pushes blood into the aorta. The bottom number (diastolic) is the lowest pressure between beats, when your heart is relaxing and refilling. Both matter, and both need to stay in range for your reading to count as “good.”
There’s also a hidden third number worth knowing: pulse pressure, which is simply the top number minus the bottom number. A reading of 120/80 gives you a pulse pressure of 40, which is considered healthy. A widening gap between the two numbers can signal stiffening arteries, even when both individual numbers look acceptable.
The Full Blood Pressure Scale
- 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
Notice that only one number needs to be high for you to land in a higher category. If your systolic is 118 but your diastolic is 85, that’s stage 1 hypertension, not normal. This catches people off guard because the top number can look fine while the bottom number quietly creeps up.
Does the Target Change as You Age?
The definition of normal stays the same at every age: below 120/80. But whether and how aggressively to treat high readings in older adults gets more nuanced. Doctors weigh other health conditions, medication side effects, and fall risk before choosing a target for someone in their 70s or 80s.
That said, 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. So for many older adults, the same “good” number still applies. The difference is that reaching it may require more careful balancing of treatments.
How to Get an Accurate Reading
A single reading taken under the wrong conditions can be off by 10 to 15 points, enough to push you from normal into elevated or vice versa. The CDC recommends a specific protocol to get a number you can trust:
- Timing: Don’t eat, drink, or use caffeine for 30 minutes beforehand. Empty your bladder first.
- Position: Sit in a chair with back support for at least 5 minutes. Both feet flat on the floor, legs uncrossed.
- Arm placement: Rest your arm on a table at chest height. The cuff goes on bare skin, not over a sleeve.
- During the reading: Don’t talk. Stay still.
- Repetition: Take at least two readings, 1 to 2 minutes apart, and average them.
If you’ve ever gotten a surprisingly high number at a doctor’s office after rushing in from the parking lot, that protocol explains why. Stress, a full bladder, crossed legs, and even conversation can all inflate your reading temporarily. Home monitoring with a validated cuff, following these steps consistently, often gives a more reliable picture than a single clinic visit.
Good Pressure in the Eyes
Blood pressure isn’t the only pressure your body needs to keep in range. Inside each eye, fluid creates a constant pressure that maintains the eye’s shape. Normal intraocular pressure falls between 10 and 20 mmHg. When that pressure gets too high, it can damage the optic nerve, which is the mechanism behind glaucoma.
Eye pressure is trickier to interpret than blood pressure, though. Some people tolerate pressures above 20 with no damage at all, a condition called ocular hypertension. Others develop glaucoma even with pressure in the normal range. So while 10 to 20 mmHg is the general target, your eye doctor looks at the full picture, including the health of your optic nerve and your visual field, rather than the number alone.
Pressure Inside the Skull
A less familiar but equally important measurement is intracranial pressure, the pressure of the fluid surrounding your brain and spinal cord. In a healthy adult lying down, this runs between 7 and 15 mmHg. Anything above 20 is considered dangerous and can compress brain tissue.
Unlike blood pressure and eye pressure, you can’t measure intracranial pressure at home. It only becomes relevant in serious situations like head injuries, brain infections, or tumors. Warning signs of dangerously high intracranial pressure include severe headache, vision changes, irregular breathing, and a slowing heart rate. These typically develop in hospital settings where monitoring is already underway.
What “Good” Really Means
Across all these types of pressure, the pattern is the same: your body operates within a narrow range, and drifting outside it causes damage gradually. Blood pressure is the one you have the most control over and the one most worth tracking, because it responds to everyday choices like salt intake, exercise, sleep, stress, and weight management. A reading below 120/80, taken correctly, is the clearest single indicator that your cardiovascular system is under healthy pressure. If your numbers are creeping into the elevated range, that’s not yet hypertension, but it is the body’s early signal that something is shifting.