Why does height percentile matter for pediatric BP?

Blood pressure in children is correlated with body size. Taller children naturally have somewhat higher normal BP. The AAP 2017 tables stratify normative values by height percentile to avoid over-diagnosing tall children and under-diagnosing short ones.

What are the AAP 2017 classification cut-points?

For children under 13, Stage 2 begins at the 95th percentile plus 12 mmHg; Stage 1 begins at the 95th percentile, and Elevated BP begins at the 90th percentile or 120/80, whichever threshold is lower. Adolescents age 13 or older use the fixed adult-style thresholds: 120/<80 Elevated, 130/80 Stage 1, and 140/90 Stage 2.

Does this tool store patient data?

No. All calculations are performed in your browser. Nothing is sent to any server and no data is stored.

What if the child's height percentile falls between listed values?

Select the closest standard height percentile (5th, 10th, 25th, 50th, 75th, 90th, or 95th) from the growth chart to look up the corresponding AAP 2017 normative blood pressure thresholds.

Pediatric Blood Pressure Percentile

Enter a child's age, sex, height percentile, systolic and diastolic BP to get their blood pressure percentile and AAP 2017 classification.

Patient Parameters

Sex

Male Female

Age (years, 1–17)

Height Percentile

Use a growth chart or clinical measurement to determine height percentile.

Systolic BP (mmHg)

Diastolic BP (mmHg)

Enter values and click Calculate to see the percentile result.

Classification

Blood Pressure Percentiles

Systolic BP

percentile

Diastolic BP

percentile

Reference Thresholds for This Child

AAP 2017 · Age -- · -- · Height --th percentile

Percentile	Systolic	Diastolic

Medical disclaimer: This tool is for educational and decision-support purposes only. Hypertension diagnosis requires confirmed readings on at least three separate occasions. Always refer to a licensed clinician for diagnosis and management. Data source: Flynn JT et al. Pediatrics. 2017;140(3):e20171904.

Summary

This calculator uses the normative blood pressure tables from the 2017 American Academy of Pediatrics (AAP) clinical practice guideline to estimate systolic and diastolic BP percentiles for children aged 1-17 years. Inputs include age, sex, and height percentile. Results classify the reading as normal (< 90th percentile), the 90th–95th percentile band, Stage 1 Hypertension (95th–99th + 12 mmHg), or Stage 2 Hypertension (> 99th + 12 mmHg). All calculations run locally in the browser; no data is transmitted.

How it works

Select the child's sex (male or female).
Enter the child's age in whole years (1 through 17).
Choose the child's height percentile (5th, 10th, 25th, 50th, 75th, 90th, or 95th).
Enter the measured systolic and diastolic blood pressure in mmHg.
The calculator looks up the AAP 2017 normative table row for that age, sex, and height percentile to find the 50th, 90th, 95th, and 99th percentile thresholds.
It uses the selected standard height percentile column and classifies the reading per AAP 2017 cut-points.

Use cases

Screen children for hypertension at well-child visits.
Confirm whether a single elevated office reading warrants follow-up.
Educate parents on where their child's blood pressure stands relative to peers.
Support clinical decision-making when referring to a pediatric cardiologist or nephrologist.
Track blood pressure trends across annual visits.
Quickly apply AAP 2017 definitions without manual table lookups.

Frequently Asked Questions

Last updated: 2026-06-18 · Reviewed by Nham Vu