Normal blood pressure for adults is below 120/80 mmHg. That means a top number (systolic) under 120 and a bottom number (diastolic) under 80. Once either number crosses those thresholds, your blood pressure falls into elevated or high blood pressure territory, even if you feel perfectly fine.
What the Two Numbers Mean
A blood pressure reading gives you two numbers, written as one over the other (like 118/76). The top number, systolic pressure, measures how much force pushes against your artery walls each time your heart squeezes. The bottom number, diastolic pressure, measures the pressure in your arteries between beats, when your heart is relaxing and refilling with blood.
Both numbers matter. You can have a normal systolic reading but an elevated diastolic reading, or vice versa. If either number lands in a higher category, the higher category is the one that applies to you.
Blood Pressure Categories for Adults
The American Heart Association and the American College of Cardiology define four categories:
- Normal: systolic below 120 and diastolic below 80
- Elevated: systolic 120 to 129 and diastolic below 80
- Stage 1 hypertension: systolic 130 to 139 or diastolic 80 to 89
- Stage 2 hypertension: systolic 140 or higher, or diastolic 90 or higher
Elevated blood pressure is not yet hypertension, but it signals that your numbers are trending in the wrong direction. Without lifestyle changes, elevated readings often progress to stage 1 hypertension over time.
European guidelines draw the line differently. The 2024 European Society of Cardiology guidelines classify anything below 120/70 as “nonelevated,” readings of 120 to 139 over 70 to 89 as “elevated,” and 140/90 or above as hypertension. The ESC deliberately avoids the word “normal” for any blood pressure level, because cardiovascular risk rises continuously as blood pressure increases, even within the lower range. The practical takeaway: a reading of 115/70 is better for your heart than 119/79, even though both are considered “normal” in the U.S. system.
When Blood Pressure Is Too Low
A reading below 90/60 is generally considered low blood pressure, or hypotension. But low numbers are only a concern if they cause symptoms. Plenty of people walk around with a resting blood pressure in the low 90s over 60s and feel completely fine.
Symptoms that suggest your blood pressure is too low include dizziness, lightheadedness, blurred vision, fatigue, trouble concentrating, and nausea. If low pressure drops suddenly or severely, it can cause cold, clammy skin, rapid shallow breathing, confusion, and fainting. That level of drop needs immediate medical attention.
Blood Pressure in Children and Teens
The adult thresholds don’t apply to kids. In children and adolescents, normal blood pressure depends on age, sex, and height. Pediatricians use percentile charts from the National Heart, Lung, and Blood Institute that list expected systolic and diastolic values for ages 1 through 17. A reading at or above the 90th percentile for a child’s age and height group is considered elevated, and at or above the 95th percentile is considered hypertension. There is no single number that works across all ages the way 120/80 does for adults, so your child’s doctor interprets the reading in context.
How to Get an Accurate Reading
Blood pressure is surprisingly easy to measure wrong. Small positioning mistakes can push your numbers higher than they actually are. The CDC recommends the following steps for an accurate reading:
- Rest first: Sit in a comfortable chair with your back supported for at least 5 minutes before measuring.
- Skip food and drinks: Don’t eat or drink anything for 30 minutes beforehand.
- Empty your bladder: A full bladder can raise your reading.
- Position your body correctly: Both feet flat on the floor, legs uncrossed, arm resting on a table at chest height.
- Use bare skin: Place the cuff directly on your arm, not over clothing.
- Stay quiet: Don’t talk while the reading is being taken.
Crossing your legs or letting your arm hang at your side instead of resting it at chest height can inflate your numbers noticeably. If you’ve ever gotten a surprisingly high reading at the doctor’s office, poor positioning may have been part of the reason.
Why Readings Vary From Day to Day
Your blood pressure is not a fixed number. It fluctuates throughout the day based on activity, stress, caffeine, hydration, sleep, and even the temperature of the room. A single high reading does not mean you have hypertension. That’s why doctors typically want to see a pattern across multiple readings before making a diagnosis.
One well-known source of misleading readings is white coat hypertension, where your blood pressure spikes in a medical setting but reads normal at home. This affects 15% to 30% of people who have high blood pressure readings in the office. If your doctor suspects white coat hypertension, they may ask you to monitor your blood pressure at home over several days or wear an ambulatory monitor that takes readings throughout a 24-hour period.
Home monitoring is also useful for catching the opposite pattern, called masked hypertension, where your numbers look fine at the doctor’s office but run high during everyday life. Taking readings at the same time each day, ideally morning and evening, gives you and your doctor a much clearer picture of where you actually stand.