Normal blood pressure is below 120/80 mm Hg. That means the top number (systolic) stays under 120 and the bottom number (diastolic) stays under 80. This threshold was reaffirmed in the 2025 guidelines from the American Heart Association and American College of Cardiology, and it applies to adults of all ages.
What the Two Numbers Mean
A blood pressure reading always has two numbers. The top number, systolic pressure, measures the force inside your arteries when your heart beats and pushes blood out. The bottom number, diastolic pressure, measures the force when your heart rests between beats. It’s always lower than the top number because the arteries aren’t under active pumping pressure during that pause.
Both numbers matter. High systolic pressure carries a greater risk of stroke, but an eight-year study of more than 1.3 million adults found that elevated diastolic pressure independently raises cardiovascular risk too, regardless of what the top number reads. So a reading of 118/84 isn’t truly “normal” even though the systolic number looks fine.
Blood Pressure Categories for Adults
Once blood pressure climbs above 120/80, it falls into progressively more serious categories:
- 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 the word “or” in the hypertension stages. Only one number needs to be high for the reading to count as high blood pressure. If your systolic is 142 but your diastolic is 78, that’s still stage 2 hypertension.
When Blood Pressure Is Too Low
A reading below 90/60 mm Hg is generally considered low blood pressure, or hypotension. Some people naturally run low without any symptoms, and that’s not a problem. It becomes concerning when it causes dizziness, blurred vision, fatigue, fainting, or trouble concentrating. Even a drop of just 20 mm Hg from your usual level can trigger lightheadedness, which is why standing up too fast sometimes makes you feel faint.
Differences Between Men and Women
The official cutoff for “normal” is the same regardless of sex, but men and women don’t follow identical patterns across their lifetimes. Before menopause, men typically have blood pressure about 6 to 10 mm Hg higher than women of the same age. This gap appears as early as puberty: by ages 16 to 18, boys tend to have systolic readings 10 to 14 mm Hg higher than girls.
After menopause, the gap narrows and eventually reverses. Data from the large National Health and Nutrition Examination Survey showed that by ages 60 to 69, women in several ethnic groups had higher blood pressure than men of the same background. By 70 to 79, this trend held across populations. The practical takeaway is that women shouldn’t assume they’re protected from high blood pressure indefinitely. Post-menopausal monitoring becomes especially important.
Normal Blood Pressure in Children
Children have lower blood pressure than adults, and what counts as “normal” depends on age, sex, and height. Rather than a single cutoff, pediatric blood pressure is compared to percentiles for kids of the same age and size. A 10-year-old boy at an average height, for example, would typically have a reading around 102/61, while the threshold for concern starts around 117/76 (the 90th percentile). Girls of the same age have nearly identical ranges. Blood pressure rises gradually throughout childhood, so a number that’s normal for a 5-year-old could be concerning for a toddler.
Normal Blood Pressure During Pregnancy
The normal threshold during pregnancy is the same as for other adults: below 120/80. What changes is the clinical urgency when readings go high. Gestational hypertension is diagnosed when blood pressure reaches 140/90 or higher after 20 weeks of pregnancy in someone who previously had normal readings. This is taken seriously because it can progress to preeclampsia, a condition that affects multiple organs and can be dangerous for both the pregnant person and the baby.
How to Get an Accurate Reading
Blood pressure fluctuates throughout the day based on stress, caffeine, activity, and even a full bladder. A single high reading doesn’t necessarily mean you have high blood pressure, and a single normal one doesn’t guarantee you’re in the clear. What matters is your typical level across multiple readings taken correctly.
For an accurate measurement, sit in a chair with your back supported for at least five minutes before the reading. Keep both feet flat on the floor with your legs uncrossed. Rest your arm on a table so the cuff sits at chest height, and place the cuff against bare skin rather than over a sleeve. Talking, scrolling your phone, or sitting on an exam table with your feet dangling can all push the reading higher than your true resting pressure.
Why Home and Office Readings Can Differ
If your blood pressure seems high every time you visit a doctor but fine at home, you may have what’s called white coat hypertension. This affects 15% to 30% of people diagnosed with high blood pressure. The stress of a medical setting can push readings to 140/90 or above in the office while at-home measurements stay below 135/85.
Doctors can identify this pattern by comparing at least three elevated office readings against a 24-hour home monitoring log or an ambulatory monitor you wear throughout the day. If your doctor has flagged high readings, tracking your blood pressure at home for a week or two before your next appointment gives both of you a much clearer picture of where you actually stand.