health ToolUpdated 2026-09-20
Child Height Predictor & Growth Calculator
Curious how tall your son or daughter will grow to be? Use the clinically validated Tanner Mid-Parental Height formula to calculate your child’s projected adult height range in feet, inches, and centimeters.
Formula & Mathematical Methodology
Boy = (Father + Mother + 5) ÷ 2; Girl = (Father + Mother - 5) ÷ 2
The Tanner Mid-Parental formula is the standard genetic predictor used by pediatricians worldwide. Because adult men are on average 5 inches (13 cm) taller than adult women, 5 inches are added for boys or subtracted for girls.
Step-by-Step Worked Example
Scenario: Son of a 5'10" (70 in) father and 5'4" (64 in) mother.
1. Sum parental heights: 70 + 64 = 134 inches.
2. Add 5 inches for a male child: 134 + 5 = 139 inches.
3. Divide by 2: 139 ÷ 2 = 69.5 inches (5 feet 9.5 inches).
4. Convert to metric: 69.5 × 2.54 = 176.5 cm.
5. Normal statistical genetic range (±2 inches): 5'7.5" to 5'11.5".
Final Calculated Result: 5' 10" (177 cm) [Range: 5'8" – 6'0"]
Frequently Asked Questions
What factors beyond genetics influence adult height?
While genetics account for approximately 60–80% of final height, environmental factors including childhood nutrition, quality of sleep (growth hormone secretion), and chronic illness also play critical roles.
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