Child Height Predictor
Predict your child's adult height using the mid-parental height method.
Enter mother's and father's heights in feet/inches or cm for boys and girls.
Predicting a child’s adult height uses the Mid-Parental Height (MPH) method, which is the most widely used clinical formula. It estimates height based on the genetic contribution of both biological parents.
Formula for boys: Predicted Height = ((Father’s Height + Mother’s Height + 13 cm) / 2) ± 8.5 cm In inches: ((Father’s Height + Mother’s Height + 5 inches) / 2) ± 3.3 inches
Formula for girls: Predicted Height = ((Father’s Height + Mother’s Height − 13 cm) / 2) ± 8.5 cm In inches: ((Father’s Height + Mother’s Height − 5 inches) / 2) ± 3.3 inches
The ±8.5 cm (±3.3 in) range accounts for individual genetic variation — most children fall within this band.
Worked example: Father is 5'10" (70 in), Mother is 5'5" (65 in). Predicting for a son: Predicted Height = (70 + 65 + 5) / 2 = 140 / 2 = 70 inches (5'10") Range: 66.7 in to 73.3 in (5'6.7" to 6'1.3")
Alternative — Bone age method: A more accurate prediction can be made using an X-ray of the child’s left hand/wrist to assess skeletal maturity (bone age). This requires a doctor.
Height doubling rule of thumb: A child’s height at age 2 is roughly half their adult height. A boy’s height at age 2.5 ≈ adult height / 2 A girl’s height at age 2 ≈ adult height / 2
Factors that influence final height:
- Genetics (accounts for ~80% of variation)
- Nutrition, especially calcium and protein during growth
- Sleep (growth hormone is released during deep sleep)
- Overall health and chronic illness history
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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