Estimate adult height from parents’ heights using the rough mid-parental method, with metric and inch inputs.
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1 – 300
Rough mid-parental adult height estimate
178.9 cm
A rough family-height estimate with substantial individual variation. It does not use a child’s age, growth pattern, puberty timing or bone age and cannot diagnose growth problems. A pediatrician’s growth-chart review is more informative.
Average the two parents’ heights.
Add 2½ inches (6.35 cm) for the boy formula, or subtract it for the girl formula.
Average the parents’ adult heights. Add 2½ inches for the boy formula or subtract 2½ inches for the girl formula. The same adjustment is exactly 6.35 cm.
With parents 65 and 71 inches tall, the average is 68 inches. The boy-formula estimate is 70.5 inches, with broad individual variation.
No. It does not use the child’s age, growth velocity or puberty timing. A pediatric growth-chart review provides information this family-height estimate cannot.
Last updated . Results are estimates for informational purposes only.