Use childrens percentiles calculator for body weight and height if your child is more than 2 years old. Is your child growing adequately? Is he/she gaining weight and height at the normal rate? By this calculator, you can assess and track your child’s growth at home. Our child percentile calculator is one (only one!) calculating form that replaces 8 growth charts (one for every measurement). Just enter your child’s measurements to automatically obtain all his percentiles by one click. To learn more about child growth charts and percentile.