Mid-Parental Height Calculator
How tall will your child be? Use the clinical Tanner-Davies formula to estimate your child's genetic height potential based on the heights of both biological parents.
Last updated: March 3, 2026
Genetic Estimate Only
This tool calculates genetic potential. Factors like nutrition, general health, and hormonal imbalances can cause a child's actual height to diverge significantly from this target.
5' 9.5"
*95% of children will reach a final adult height within this 4-inch (10 cm) margin.
Note: The Tanner-Davies formula is a clinical estimate based strictly on genetics. Actual height can be influenced by nutrition, chronic illness, and environmental factors.
How Pediatricians Use This Target
Your child's target height is a benchmark used alongside standard pediatric growth charts.
Tracking Percentiles
Doctors will plot the calculated Target Adult Height on a growth chart at age 18-20. They then look at your child's current height percentile. If a child is tracking along a percentile curve that leads directly to their calculated Target Height, their growth is considered genetically normal and healthy.
Identifying Growth Issues
If a child's current growth trajectory is trending to finish far outside the 95% Confidence Interval (+/- 4 inches) of their Mid-Parental Target, it may prompt a pediatrician to investigate further for underlying nutritional, endocrine, or chronic health issues affecting growth.
Frequently Asked Questions
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