Normal blood pressure is below 120/80 mm Hg. Anything above that falls into progressively higher-risk categories, from elevated (120–129 systolic) through stage 1 and stage 2 hypertension, up to hypertensive crisis at 180/120 or above. Below 90/60 is generally considered low. Here’s what each range means and how to make sense of your numbers.
What the Two Numbers Mean
A blood pressure 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 is enough to push you into a higher category.
The Five Adult Categories
The American Heart Association and American College of Cardiology define five ranges for adults. The 2025 guidelines reaffirmed these same cutoffs:
- Normal: Below 120 systolic and below 80 diastolic
- Elevated: 120–129 systolic and below 80 diastolic
- Stage 1 hypertension: 130–139 systolic or 80–89 diastolic
- Stage 2 hypertension: 140 or higher systolic or 90 or higher diastolic
- Hypertensive crisis: 180 or higher systolic and/or 120 or higher diastolic
Notice the word “or” in the hypertension stages. If your top number is 135 but your bottom number is 75, you still fall into stage 1 hypertension because of that systolic reading alone. The higher category always wins.
Low Blood Pressure
A reading below 90/60 mm Hg is generally considered low blood pressure (hypotension). For some people, especially younger adults who are otherwise healthy, this causes no symptoms at all and isn’t a problem. It becomes a concern when it causes dizziness, fainting, blurred vision, or fatigue, which can signal that your brain and organs aren’t getting enough blood flow. Sudden drops in blood pressure, rather than a consistently low baseline, tend to cause the most noticeable symptoms.
Hypertensive Crisis
A reading of 180/120 or higher is a hypertensive crisis, and what you do next depends on how you feel. If you have symptoms like chest pain, headache, vision changes, or shortness of breath, call 911 immediately. This may be a hypertensive emergency, where organs are actively being damaged.
If you hit 180/120 but feel fine, sit quietly for a few minutes and measure again. If it stays that high, seek medical care the same day. A single spike during stress or exercise doesn’t necessarily mean you’re in danger, but sustained readings at this level need attention fast.
U.S. vs. European Guidelines
If you’ve seen conflicting information about where hypertension starts, there’s a reason. American guidelines set the threshold at 130/80, while European guidelines (from the European Society of Cardiology) define hypertension as 140/90. Both groups reviewed the same body of evidence and came to different conclusions about where the benefits of treatment outweigh the risks.
In practice, the European approach reserves the hypertension label for higher readings but still recommends treating down to 130/80 in people at high cardiovascular risk. The American approach labels more people as hypertensive but often recommends lifestyle changes rather than medication for stage 1 cases. The gap is smaller than it appears.
Blood Pressure During Pregnancy
Pregnancy has its own set of cutoffs. Gestational hypertension is defined as a systolic reading of 140 or higher and/or a diastolic reading of 90 or higher that first appears after 20 weeks of pregnancy in someone who previously had normal blood pressure. When high blood pressure during pregnancy is accompanied by signs of organ involvement (protein in the urine, liver problems, or severe headaches), it may indicate preeclampsia, which requires close monitoring and sometimes early delivery.
Readings that would be classified as merely “stage 1” in a non-pregnant adult are taken more seriously during pregnancy because the risks to both mother and baby escalate quickly.
Children and Teens Use Different Standards
There is no single “normal” number for children. Pediatric blood pressure is evaluated using percentile charts based on the child’s age, sex, and height. A reading at the 90th percentile or above for a child’s demographic group is considered elevated, and at the 95th percentile or above it’s classified as hypertension. This means a blood pressure that’s perfectly normal for a 16-year-old boy might be high for a 6-year-old girl of the same height. Your pediatrician plots these numbers on standardized charts rather than comparing against a fixed cutoff.
White Coat and Masked Hypertension
Your blood pressure in a clinic may not match your blood pressure at home, and the direction of that mismatch matters. White coat hypertension describes people whose readings are high in the office (140/90 or above) but normal outside of it (below 135/85 during the day). Roughly the opposite is masked hypertension: normal readings at the doctor’s office but elevated readings during daily life.
Masked hypertension is the more dangerous of the two because it often goes undetected and untreated. White coat hypertension is generally considered lower risk, though it may signal a tendency toward developing sustained high blood pressure over time. If your office readings consistently seem higher or lower than what you see at home, ambulatory monitoring (wearing a cuff that takes readings throughout the day and night) can clarify the picture.
How to Get an Accurate Reading
A single blood pressure reading is a snapshot, and snapshots can be misleading. Small mistakes in how you measure can inflate your numbers by 10 points or more. The CDC recommends the following for reliable home readings:
- Rest first: Sit with your back supported for at least 5 minutes before measuring.
- Position your arm correctly: Rest it on a table at chest height. Letting your arm hang at your side can raise the reading.
- Keep both feet flat on the floor: Crossing your legs has been shown to increase blood pressure during measurement.
- Use bare skin: Place the cuff directly on your arm, not over clothing.
- Don’t eat, drink, or talk: Avoid food and beverages for 30 minutes beforehand, empty your bladder, and stay silent during the reading.
Taking two or three readings a minute apart and averaging them gives a more reliable result than relying on a single measurement. Morning readings before coffee or medication, and evening readings before bed, tend to give the most consistent picture of your day-to-day blood pressure.