Guide
Yes. Height is highly heritable, but it is not an average of two parents. Regression to the mean and the ±8.5 cm Tanner band leave room for a child clearly taller than both.
It combines the child’s current stature percentile (CDC 2000), both parents (Tanner 1970 and Luo 1998), and Khamis–Roche when age is 4–17.5 and weight is entered. The headline number stays free. The $4.99 Full Growth Report adds the range, method split, growth window, and a printable page.
It does not lengthen bones, reopen growth plates, or replace a pediatrician. A falling percentile, delayed puberty, or chronic illness belongs in clinic.
More questions: How tall will my child be? · How tall will my son be? · How tall will my daughter be? · Khamis–Roche calculator · Mid-parental height calculator · Child height percentile · Adult height predictor · Can short parents have a tall child? · How accurate are height predictors? · Height for youth athletes