What is the Child Height Predictor?
This tool uses the Mid-Parental Height Formula, a standard method in pediatrics to estimate a child's genetic height potential. It calculates a target height range based on the average of the parents' heights, adjusted for the child's gender. The formula is endorsed by organizations such as the American Academy of Pediatrics for general growth screening.
QuickDuck Tools – Educational tool for height estimation. Not a substitute for professional medical advice.
Child Height Prediction Calculator
Prediction Result
(This estimation has a typical range of ±5 cm)
How is Adult Height Estimated? (Mid-Parental Formula)
The Mid-Parental Height Formula is a simple genetic prediction method used by pediatricians worldwide:
👦 For Boys
(Father + Mother + 13) ÷ 2
The extra 13 cm accounts for the average height difference between adult males and females.
👧 For Girls
(Father + Mother - 13) ÷ 2
Subtracting 13 cm adjusts for the average female height relative to the parents' average.
📐 Example: Father 180 cm, Mother 165 cm → Boy predicted height: (180 + 165 + 13) / 2 = 179 cm. Girl predicted height: (180 + 165 - 13) / 2 = 166 cm.
Reference: American Academy of Pediatrics. The result represents the mid-parental target height; actual adult height usually falls within ±5 cm of this value for about 80% of children.
How Accurate is This Height Prediction?
The Mid-Parental Height Formula provides a statistical estimate, not a guaranteed outcome. Research indicates that approximately 80% of children reach an adult height within ±5 cm of the calculated target height. However, several factors influence final height beyond genetics.
🧬 Genetic Limitations
Height is a polygenic trait, meaning hundreds of genes contribute. The formula captures the average parental contribution but cannot account for rare gene variants or unexpected growth patterns.
🍎 Environmental Factors
Nutrition, physical activity, sleep quality, and overall health during childhood and adolescence significantly impact growth. Chronic illness or hormonal imbalances can alter the predicted trajectory.
This calculator is intended for educational and general reference purposes. For clinical growth assessment, consult a pediatrician who can evaluate bone age and growth charts.
Did This Predictor Match Your Child's Actual Height?
Parents use this tool to get a general idea. Your feedback helps others understand the typical accuracy.
21 votes · 52% found it accurate
Frequently Asked Questions
Q: How reliable is the Mid-Parental Height Formula?
A: It provides a reasonable estimate. About 80% of children reach a height within ±5 cm of the calculated target. It is used as a screening tool by pediatricians.
Q: Can I predict my child's exact adult height?
A: No formula can predict exact height. Factors like nutrition, hormones, and timing of puberty cause individual variation. Bone age X‑rays offer a more precise assessment.
Q: What if my child is much taller or shorter than the prediction?
A: This may indicate early or late puberty, nutritional issues, or other health factors. Consult a pediatrician if you have concerns about growth.
Q: Does birth order or number of siblings affect height?
A: Studies show a slight correlation—firstborns are sometimes marginally taller—but genetics and nutrition are far more significant factors.
Q: Is this calculator suitable for all ethnicities?
A: The formula is a general genetic estimate. Population‑specific growth charts may provide more tailored percentiles, but the mid‑parental method is widely applicable.