Height Percentile
Average height boy at well-child visit for kindergarten check
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Evidence-based calculations Used in clinical settings worldwide Regular monitoring recommended
Ready to run the numbers?
Why: This calculation helps assess important health parameters for clinical and personal wellness tracking.
How: Enter your values above and the calculator will apply validated formulas to compute your results.
Run the calculator when you are ready.
👦 Typical 5-Year-Old Boy
Average height boy at well-child visit for kindergarten check
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👧 Short Stature Concern
8-year-old girl referred for short stature evaluation
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🏀 Tall Adolescent Boy
12-year-old boy tracking above 95th percentile
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👶 Former Preterm (3 Years)
Born at 32 weeks, now 3 years old, catch-up growth assessment
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📈 Teen Growth Monitoring
14-year-old boy tracking growth velocity during puberty
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Sample Examples
👦 Typical 5-Year-Old Boy
Average height boy at well-child visit for kindergarten check
👧 Short Stature Concern
8-year-old girl referred for short stature evaluation
🏀 Tall Adolescent Boy
12-year-old boy tracking above 95th percentile
👶 Former Preterm (3 Years)
Born at 32 weeks, now 3 years old, catch-up growth assessment
📈 Teen Growth Monitoring
14-year-old boy tracking growth velocity during puberty
Enter Child's Information
Measurements
Parental Height (Optional - for target height)
Previous Measurement (Optional - for growth velocity)
Clinical Context
For informational purposes only — not medical advice. Consult a healthcare professional before acting on results.
🏥 Health Facts
— WHO
— CDC
What is a Height Percentile Calculator?
A height percentile calculator determines where a child's height falls compared to other children of the same age and gender. Using CDC growth charts and the LMS method, this tool calculates precise percentiles and z-scores to help parents and healthcare providers assess growth patterns.
Percentile Ranking
Shows what percentage of children are shorter than your child. A 75th percentile means taller than 75% of peers.
Z-Score Analysis
Measures how many standard deviations the height is from the mean. Used clinically to identify growth concerns.
Genetic Potential
Mid-parental height calculation predicts expected adult height based on parental genetics.
How Does Height Percentile Calculation Work?
This calculator uses the CDC growth charts and the LMS (Lambda-Mu-Sigma) method developed by the CDC for accurate percentile calculations. The LMS method accounts for the skewed distribution of height measurements across different ages.
The LMS Method Explained
LMS Parameters
- L (Lambda): Box-Cox transformation power for skewness
- M (Mu): Median height for age/gender
- S (Sigma): Coefficient of variation
Calculation Steps
- Look up LMS values for child's age and gender
- Calculate z-score using LMS formula
- Convert z-score to percentile using normal CDF
- Determine growth category and recommendations
When to Use This Calculator
Routine Monitoring
- • Well-child visits
- • Annual growth assessment
- • School health screenings
- • Sports physicals
Clinical Concerns
- • Short stature evaluation
- • Growth velocity concerns
- • Crossing percentile lines
- • Constitutional growth delay assessment
Height Percentile Formulas
Z-Score Calculation (LMS Method)
When L = 1: Z = (Height - M) / (M × S)
Mid-Parental Height (Target Height)
Girls: MPH = (Mother + Father - 13 cm) / 2
Target range: MPH ± 8.5 cm
Growth Velocity
Normal prepubertal velocity: 5-6 cm/year
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