A good blood pressure reading is below 120/80 mmHg. That’s the threshold the American Heart Association defines as “normal,” and it’s the target associated with the lowest risk of heart disease and stroke. If your reading lands here, your blood vessels are under a healthy amount of pressure and your heart isn’t working harder than it needs to.
But blood pressure isn’t just “normal” or “high.” It falls on a spectrum, and understanding where your numbers sit on that spectrum tells you a lot about what to do next.
Blood Pressure Categories Explained
Your reading has two numbers. The top number (systolic) measures the pressure in your arteries when your heart beats. The bottom number (diastolic) measures the pressure between beats, when your heart is resting. Both matter, and either one being too high can bump you into a higher category.
- 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” is essentially a yellow light. Your blood pressure isn’t causing damage yet, but without changes it will likely progress to stage 1 hypertension. Stage 1 typically calls for lifestyle changes, while stage 2 usually involves medication alongside those changes.
It’s worth noting that European guidelines set the hypertension threshold higher, at 140/90 mmHg rather than the 130/80 used in the United States. If you’re reading health information from a European source, that explains why the numbers may look different.
When Blood Pressure Is Too Low
A reading below 90/60 mmHg is generally considered low blood pressure, or hypotension. Unlike high blood pressure, low blood pressure is typically only a problem if it causes symptoms: dizziness, blurred vision, fatigue, trouble concentrating, nausea, or fainting. A drop of just 20 mmHg from your usual reading can trigger these symptoms, even if the absolute number still looks “normal” on a chart.
Extreme low blood pressure can cause shock, marked by confusion, cold and clammy skin, rapid shallow breathing, and a weak pulse. This is a medical emergency. But for most people, running on the low side without symptoms is perfectly fine and can even be a sign of good cardiovascular fitness.
The Gap Between Your Two Numbers
The difference between your systolic and diastolic readings is called pulse pressure. If your blood pressure is 120/80, your pulse pressure is 40, which is considered healthy. A pulse pressure consistently above 40 suggests your arteries are becoming stiffer, and a pulse pressure above 60 is a recognized risk factor for heart disease, particularly in older adults. This is why a reading like 160/70 can be more concerning than it first appears. The top number looks high but the real warning sign is the 90-point gap, signaling significant arterial stiffness.
How Blood Pressure Changes With Age
The target of below 130/80 mmHg applies to all adults, including those over 65 and even over 80, according to the 2025 guidelines from the American Heart Association and American College of Cardiology. This is a shift from older thinking that accepted higher readings as a normal part of aging.
That said, blood pressure does naturally change as you get older. Systolic pressure tends to rise steadily throughout life as arteries lose elasticity. Diastolic pressure rises until about age 50, plateaus for a decade, then actually starts to decline. This is why isolated high systolic readings become more common with age, and why that pulse pressure gap widens. The absolute risk of cardiovascular disease at any given blood pressure level is substantially higher in older adults compared to younger ones, which is exactly why hitting that target still matters later in life. For people who are very frail, institutionalized, or have a limited life expectancy, the target may be adjusted through shared decision-making with their care team.
Blood Pressure During Pregnancy
Pregnancy has its own set of thresholds. Gestational hypertension is diagnosed when blood pressure reaches 140/90 mmHg or higher after 20 weeks of pregnancy in someone who previously had normal readings. Severe hypertension during pregnancy is defined as 160/110 or higher, which requires urgent management. These thresholds are more conservative than the general population cutoffs because high blood pressure during pregnancy carries specific risks, including preeclampsia, a serious condition that can affect the liver, kidneys, and brain.
How to Get an Accurate Reading
A single reading doesn’t tell you much. Blood pressure fluctuates throughout the day based on activity, stress, hydration, and even whether you’ve recently eaten. What matters is a pattern of readings taken correctly over time. The CDC recommends these steps for an accurate reading at home:
- Empty your bladder before measuring. A full bladder can raise your reading.
- Sit quietly for at least 5 minutes with your back supported in a comfortable chair.
- Rest your arm on a table at chest height with the cuff on your bare upper arm.
- Keep both feet flat on the floor. Crossing your legs can raise your reading.
Small deviations from this routine can meaningfully affect your numbers. Letting your arm hang at your side instead of resting it on a table, for example, pushes your reading higher. So does talking during the measurement or sitting on an exam table with your legs dangling.
White Coat and Masked Hypertension
Some people consistently read high at the doctor’s office but normal at home. This is called white coat hypertension, and it’s surprisingly common, affecting roughly 10% to 25% of people depending on how it’s defined. The anxiety of a medical visit genuinely raises blood pressure, and those readings don’t necessarily reflect your usual cardiovascular health.
The opposite pattern is more dangerous. Masked hypertension means your readings look normal at the doctor’s office but are elevated at home or during daily life. About 13% of the general population has this pattern, and it carries cardiovascular risks similar to sustained high blood pressure because it often goes undetected and untreated. This is one of the strongest arguments for monitoring your blood pressure at home rather than relying solely on occasional clinic visits.
What a Good Reading Actually Looks Like
A good blood pressure is below 120/80, taken after sitting quietly for five minutes with your arm properly supported. But more useful than any single number is a trend. If you’re checking at home, take two or three readings a minute apart at the same time each day, and track the average over a week or two. That average is a far more reliable picture of your cardiovascular health than any one-time measurement, whether it happens at home or in a doctor’s office.