A good blood pressure reading is below 120/80 mm Hg. That’s the threshold the American Heart Association and American College of Cardiology use to define normal blood pressure in adults. Once either number climbs above that line, your cardiovascular risk starts rising, even if you feel perfectly fine.
Blood pressure is recorded as two numbers. The top number (systolic) measures the pressure inside your arteries each time your heart squeezes. The bottom number (diastolic) measures the pressure when your heart relaxes between beats. Both matter, and if they fall into different categories, the higher category is the one that counts.
Blood Pressure Categories for Adults
Current guidelines break blood pressure into four 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
Elevated blood pressure isn’t yet hypertension, but it’s a warning. Without changes, it tends to keep climbing. Stage 1 hypertension is where measurable risk begins: a large prospective study in the Journal of the American Heart Association found that people in this range had a 35% higher 10-year risk of cardiovascular disease compared to those with normal readings. That gap persisted over a lifetime, with a 36% increase in long-term risk.
Stage 2 hypertension carries still greater risk and typically calls for medication alongside lifestyle changes. And if your reading ever hits 180/120 or higher, that’s a hypertensive crisis. Symptoms like chest pain, severe headache, blurred vision, shortness of breath, or confusion at that level require emergency care.
Why Both Numbers Matter
It’s common to focus on the top number, especially as you get older. Systolic pressure tends to rise with age as arteries stiffen, and it’s a strong predictor of heart attack and stroke. But diastolic pressure matters too. A reading of 118/92, for example, still qualifies as stage 2 hypertension because the bottom number is 90 or above, even though the top number looks fine.
The gap between the two numbers also tells a story. A wide spread, say 145/60, suggests your arteries have lost flexibility. That forces your heart to work harder with each beat, which over time raises the risk of heart attack and stroke independently of where each number falls on its own.
Targets for Diabetes and Kidney Disease
If you have diabetes or chronic kidney disease, your target is tighter than the general population’s. The American Diabetes Association recommends aiming for below 130/80, because both conditions make blood vessels more vulnerable to damage from pressure. For people with kidney disease who are also spilling significant amounts of protein into their urine, an even lower target may slow the rate at which kidney function declines.
Blood Pressure Goals After 65
The standard categories don’t change with age. Normal is still below 120/80 whether you’re 35 or 75. A major NIH-funded trial called SPRINT found that lowering systolic pressure to below 120 in adults age 50 and older significantly reduced cardiovascular disease and death.
That said, treatment decisions for older adults get more nuanced. Factors like other health conditions, medication side effects (particularly dizziness and falls), and overall fitness all shape how aggressively a doctor will push toward that target. The numbers themselves don’t shift, but the path to reaching them is more individualized.
How to Get an Accurate Reading
A single reading doesn’t tell you much. Blood pressure fluctuates throughout the day based on stress, activity, caffeine, and even whether your bladder is full. To get numbers you can actually trust, the American Heart Association recommends a specific routine for home monitoring:
- Timing: Avoid caffeine, smoking, and exercise for at least 30 minutes beforehand. Empty your bladder first.
- Rest: Sit quietly for five minutes before measuring. Don’t talk or use your phone.
- Position: Sit with your back supported, feet flat on the floor, and your arm resting on a flat surface at heart level. Place the cuff on bare skin, not over clothing, with the bottom edge just above the bend of your elbow.
- Consistency: Take readings at the same time each day so you can spot trends rather than reacting to a single number.
Skipping any of these steps can easily push your reading 10 to 15 points in either direction, which is enough to move you from one category to another.
When Office Readings Are Misleading
Some people consistently read high only at the doctor’s office. This is called white-coat hypertension, and it happens because the stress of a medical visit temporarily spikes blood pressure. The reverse also occurs: masked hypertension means your readings look normal in the office but run high during the rest of your day. Both patterns lead to misdiagnosis if the doctor relies only on in-office measurements.
If your office readings don’t match what you’re seeing at home, or if your doctor suspects either pattern, ambulatory monitoring can help. You wear a small cuff for 24 hours while it takes readings automatically throughout your normal routine. That gives a much more complete picture than any single measurement, and it’s the most reliable way to figure out whether treatment is actually needed.