A good blood pressure reading is below 120/80 mmHg. That’s the threshold the American Heart Association uses to define “normal” blood pressure, and it applies to most adults. If your reading falls in this range, your heart is pumping blood through your arteries without placing excess force on the vessel walls.
What the Two Numbers Mean
Blood pressure is always written as two numbers. The top number (systolic) measures the force of blood pushing against artery walls when your heart beats. The bottom number (diastolic) measures that force between beats, while your heart is filling with blood. Both numbers matter, and either one being too high is enough to move you into a higher category.
Blood Pressure 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
Notice that the elevated category only involves the top number. If your systolic pressure creeps into the 120s while your diastolic stays under 80, you’re not yet in hypertension territory, but you’re trending in the wrong direction. This is the window where lifestyle changes are most effective at preventing a full diagnosis.
How Age Affects Your Target
The standard below-120/80 target holds across most of adulthood. A large 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. That finding reinforced the idea that lower is generally better, even for older adults.
That said, blood pressure targets for people over 65 sometimes require nuance. Other health conditions, medication side effects, and overall fitness level all play a role. Some older adults experience dizziness or falls when blood pressure is pushed too low with medication, so doctors may adjust the goal based on the individual’s situation rather than applying a single number to everyone.
Getting an Accurate Reading
A single reading doesn’t tell you much. Blood pressure fluctuates throughout the day based on stress, caffeine, physical activity, and even how you’re sitting. To get a number you can actually trust, the CDC recommends a specific routine: sit in a comfortable chair with your back supported for at least five minutes before taking a reading. Keep both feet flat on the ground, legs uncrossed. Rest the arm wearing the cuff on a table at chest height, and place the cuff against bare skin rather than over clothing.
Skipping any of these steps can artificially raise or lower your reading. Crossing your legs, for example, can add several points to your systolic number. Talking during the measurement does the same.
White Coat and Masked Hypertension
Some people get high readings only at the doctor’s office because the setting triggers anxiety. This is called white coat hypertension, and it can lead to an unnecessary diagnosis if the doctor relies solely on in-office measurements. The opposite also happens: masked hypertension means your blood pressure reads normal at the clinic but runs high the rest of the time. Both conditions are caught through ambulatory monitoring, where you wear a cuff that takes readings automatically over 24 hours, giving a much fuller picture.
People with white coat hypertension who have normal readings everywhere else may not need medication, but they do carry a higher risk of developing true hypertension later and should be monitored over time.
Home Monitoring
If you’ve been diagnosed with high blood pressure or you’re tracking a borderline reading, home monitoring gives you far more data than occasional clinic visits. Take your blood pressure at least twice a day: once in the morning before eating or taking medication, and once in the evening. If you’ve recently started a new treatment or changed medications, check it consistently for two weeks after the change and during the week before your next appointment. This gives your doctor a trend line rather than a snapshot.
Lifestyle Changes That Lower Blood Pressure
Two interventions have the strongest evidence behind them: reducing sodium and exercising regularly.
Cutting back on salt by about 6 grams per day (roughly a teaspoon) lowers systolic blood pressure by about 5.8 points on average. The effect is nearly double in people who already have hypertension, where the same reduction drops systolic pressure by close to 11 points. Even people with normal blood pressure see a benefit of around 4 points. These effects show up within four weeks of making the change.
Regular aerobic exercise, things like brisk walking, cycling, or swimming, lowers systolic blood pressure by 4 to 10 points and diastolic by 5 to 8 points. That’s comparable to what some blood pressure medications achieve. The key word is regular: these benefits depend on consistent activity, not occasional effort.
Combining the two amplifies the effect. Someone with stage 1 hypertension who reduces sodium and adds 30 minutes of daily aerobic activity could realistically bring their numbers back into normal range without medication.
When Blood Pressure Becomes an Emergency
A reading of 180/120 or higher is classified as a hypertensive crisis. At that level, blood vessels can sustain damage, and organ injury becomes a real risk. Symptoms include severe headache, chest pain, blurred vision, shortness of breath, nausea, confusion, or seizures. If you get a reading this high on a home monitor, wait five minutes and measure again. If it’s still at or above 180/120, especially with any of those symptoms, that warrants emergency medical attention.