A good blood pressure reading is below 120/80 mm Hg. That’s the threshold for “normal” blood pressure under both the original 2017 guidelines and the updated 2025 guidelines from the American Heart Association and American College of Cardiology. 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 written as two numbers. The top number (systolic) measures the force of blood pushing against your artery walls when your heart pumps. The bottom number (diastolic) measures that pressure between beats, when your heart is filling back up with blood. Both matter, but for adults over 50, the top number is generally a stronger predictor of heart disease risk because arteries stiffen and accumulate plaque with age, which drives systolic pressure higher.
Blood Pressure Categories
These are the current categories used in clinical practice:
- 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
- Severe hypertension: Higher than 180 systolic or higher than 120 diastolic
Only one number needs to be elevated for you to land in a higher category. So a reading of 135/75 counts as stage 1 hypertension even though the bottom number looks fine.
The Treatment Goal: Under 130/80
The 2025 guidelines set a universal treatment target of below 130/80 for all adults with high blood pressure. This applies whether you have diabetes, chronic kidney disease, or no other health conditions at all. If your readings consistently sit at 130/80 or above and you have elevated cardiovascular risk, medication is typically recommended. For people at lower risk, doctors will usually suggest three to six months of lifestyle changes first before considering medication.
When Blood Pressure Is Too Low
A reading below 90/60 is generally considered low blood pressure, or hypotension. But low numbers only matter if they’re causing symptoms. A drop of just 20 points in your systolic pressure, say from 110 down to 90, can be enough to make you feel dizzy or faint. Some people naturally run on the low side and feel perfectly fine. The concern is sudden drops, not a consistently low baseline.
Pulse Pressure: The Gap Between the Numbers
The difference between your top and bottom numbers is called pulse pressure. If your reading is 120/80, your pulse pressure is 40, which is considered healthy. A pulse pressure consistently above 40 is a warning sign, and above 60 it becomes a significant risk factor for heart attacks and strokes, especially in older adults. A wide gap usually means the large arteries have stiffened, which is both a cause and a consequence of cardiovascular damage.
How to Get an Accurate Reading
A single reading in a doctor’s office doesn’t tell the full story. Blood pressure fluctuates throughout the day, and anxiety about the visit itself can push your numbers higher. Home monitoring gives a much clearer picture of where you actually stand.
For reliable home readings, avoid caffeine, smoking, and exercise for at least 30 minutes beforehand. Empty your bladder, then sit quietly for five minutes before taking a measurement. Place the cuff on your bare upper arm at heart level, with the bottom edge just above the bend of your elbow. Prop your arm on a flat surface or a pillow so it’s supported. Don’t talk or look at your phone during the reading.
Take your readings at the same time each day, and record multiple measurements. This log is far more useful to your doctor than any single number taken during an appointment.
Children Have Different Ranges
The categories above apply to adults. For children and teenagers (ages 1 through 17), normal blood pressure depends on age, sex, and height. There’s no single cutoff. Pediatricians use percentile charts that compare a child’s reading against other kids of the same size and age. A reading at or above the 95th percentile is considered high for a child, but the actual numbers vary widely. A blood pressure that’s normal for a 15-year-old boy might be elevated for an 8-year-old girl.
Why the Top Number Climbs With Age
It’s common for systolic pressure to creep upward as you get older, even if it was normal for decades. The large arteries lose flexibility over time, and plaque builds up along their walls. This means the heart has to push harder with each beat, which shows up as a higher top number. This is one reason pulse pressure tends to widen in older adults and why systolic pressure gets more attention after age 50. A rising top number isn’t inevitable, though. Regular physical activity, maintaining a healthy weight, and limiting sodium intake can slow the process significantly.