Classify child's BP using age and height-based norms.
AAP 2017 guidelines: Normal BP < 90th percentile. Elevated BP: 90th–95th percentile (or 120/80 in teens). Stage 1 HTN: 95th–99th + 12 mmHg. Stage 2 HTN: > 95th + 12 mmHg. Percentiles are based on age, sex, and height. This calculator uses simplified approximations; formal tables should be used for clinical decisions.