Work out predicted adult height instantly with clear inputs, formula shown and shareable results.
This is the mid-parental (Tanner) method: average the parents' heights, then add 6.5 cm for a boy or subtract 6.5 cm for a girl, with a plus or minus 8.5 cm range covering most outcomes. Target height from parents is the standard first check on whether a child's growth curve is where genetics would put it, before anything else is investigated.
Mid-parental height
mid-parental = (father's height + mother's height) / 2
Target height
boys = mid-parental + 6.5 cm; girls = mid-parental - 6.5 cm, plus or minus 8.5 cm
mid-parental = (father's height + mother's height) / 2. This is the mid-parental (Tanner) method: average the parents' heights, then add 6.5 cm for a boy or subtract 6.5 cm for a girl, with a plus or minus 8.5 cm range covering most outcomes.
Target height from parents is the standard first check on whether a child's growth curve is where genetics would put it, before anything else is investigated.
Enter father's height, mother's height, child's sex. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.