Predicting a child's height

This page explains how the distances are calculated on the page predicting a child’s adult height.

Height for girls is predicted by

$H_g = \frac{h}{0.00028 x^3- 0.0071 x^2 + 0.0926 x + 0.3524}$

where h is the current height and x is the current age.

For boys the corresponding formula is

$H_b = \frac{h}{0.00011 x^3 - 0.0032 x^2 + 0.0604 x + 0.3796}$

These formulas assume that girls reach their adult height at around 13.5 years and that boys reach their adult height around 16.5 years.

Of course these are only predictions based on averages. Individuals may not follow the predictions of the formula.