Guide
Khamis–Roche’s typical 90% error is about ±5 cm in the original Fels sample. No website replaces a pediatrician when percentiles are falling.
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