Normal pediatric blood pressure depends on a child’s age, sex, and height, which makes it more complex than the single threshold used for adults. For children under 13, “normal” means a reading below the 90th percentile on standardized growth charts. For adolescents 13 and older, normal is simply below 120/80 mmHg, the same cutoff used for adults.
How Pediatric Blood Pressure Differs From Adult
Adults have one universal normal range. Children don’t. A 5-year-old boy and a 12-year-old girl have very different expected readings, and a taller child within the same age group will naturally run higher than a shorter one. That’s why pediatric blood pressure is interpreted using percentile tables that account for age, sex, and height. A reading that’s perfectly normal for a 10-year-old could be a red flag in a 3-year-old.
The key categories for children, based on guidelines from the American Academy of Pediatrics, break down like this:
- Normal: Below the 90th percentile (under 13) or below 120/80 (13 and older)
- Elevated: Between the 90th and 95th percentile (under 13) or 120–129 systolic with diastolic under 80 (13 and older)
- Stage 1 hypertension: At or above the 95th percentile (under 13) or 130–139/80–89 (13 and older)
- Stage 2 hypertension: 12 mmHg or more above the 95th percentile (under 13) or 140/90 and above (13 and older)
Typical Readings by Age
Newborns have surprisingly low blood pressure. The average reading for a newborn is around 64/41 mmHg. By one to two months of age, that rises to roughly 95/58. From there, blood pressure climbs gradually through childhood.
For boys at the 50th percentile (meaning right in the middle of the normal range), typical systolic readings look like this: around 89 mmHg at age 1, 98 at age 6, 103 at age 10, 115 at age 15, and 120 by age 17. Diastolic readings climb more slowly, from about 36 at age 1 to around 59 at age 10 and 66 by age 17.
Girls follow a similar pattern but tend to run slightly lower, especially in the teenage years. A 10-year-old girl at the 50th percentile has a typical systolic reading around 103 mmHg, nearly identical to boys. But by age 17, the average girl’s systolic reading is about 113 compared to 120 for boys. Diastolic values are similar between sexes throughout childhood.
These numbers shift depending on height. A child at the 95th percentile for height will have a 50th-percentile blood pressure that’s a few points higher than a child at the 5th percentile for height. The difference is usually 3 to 5 mmHg systolic, which is why your child’s doctor factors in their growth chart position.
Why Percentiles Matter Under Age 13
A blood pressure of 110/70 sounds perfectly healthy by adult standards. But in a small 6-year-old, that same reading could land above the 95th percentile and qualify as Stage 1 hypertension. This is the core reason pediatric blood pressure can’t be judged by a single number. The percentile system exists because children’s cardiovascular systems are still developing, and what counts as “high” scales with body size.
Once a child turns 13, the system simplifies. Adolescents use the same fixed numbers as adults: under 120/80 is normal, 120–129 systolic is elevated, and 130/80 or higher is hypertension. This transition happens because by the mid-teen years, the percentile-based thresholds and the adult thresholds converge for most kids.
How Common Is High Blood Pressure in Kids
High blood pressure in children is not rare, but it’s not the norm either. Among U.S. children aged 8 to 12, about 2.3% have hypertension and another 3.5% have elevated blood pressure, based on data from 2021 to 2023. The numbers jump in adolescents: roughly 5% of 13- to 19-year-olds meet the threshold for hypertension, and another 9.4% fall in the elevated range.
The overall trend has been improving. Hypertension rates in adolescents dropped from 8.3% in the early 2000s to 5.1% in recent years. Still, the link between childhood weight and blood pressure remains strong. In younger children, high blood pressure is more often caused by an underlying medical condition, most commonly kidney disease. In adolescents, the pattern flips: the rising prevalence of obesity has made “primary” hypertension (high blood pressure without a specific medical cause) increasingly common.
White Coat Effect in Children
If your child gets a high reading at the doctor’s office, it doesn’t necessarily mean they have hypertension. White coat hypertension, where blood pressure runs high in a clinical setting but is normal at home, is extremely common in kids. Among children referred to specialists for high readings, up to 52% turn out to have white coat hypertension rather than a sustained problem.
This is why a single elevated reading isn’t enough for a diagnosis. The AAP guidelines require at least three separate elevated readings taken on different visits before a child is classified as having hypertension. If readings are consistently high in the office, the next step is typically ambulatory blood pressure monitoring, where a portable cuff takes readings throughout a normal day. This gives a much clearer picture of what’s actually going on.
Getting an Accurate Reading
Pediatric blood pressure is sensitive to technique. The cuff size matters more than most parents realize. A cuff that’s too small will give a falsely high reading, and a cuff that’s too large will read low. The bladder inside the cuff should cover about 80% of the child’s upper arm circumference. Most pediatric offices stock multiple cuff sizes for this reason.
For the most accurate result, your child should be sitting with their back supported, feet flat on the floor (not dangling from an exam table), and their arm resting at heart level. They should have been sitting quietly for three to five minutes before the measurement. Running into the office from the parking lot, crying, or talking during the reading can all push numbers up temporarily. If your child’s reading comes back high and any of these factors were at play, it’s worth mentioning to the provider.
Routine blood pressure screening starts at age 3 for most children and happens at every well-child visit. Children with risk factors like obesity, kidney problems, or a family history of early hypertension may be screened earlier or more frequently.