A measurement device and method that in one aspect determines and displays percentile information relating to growth indices, such as BMI, weight-for-length, and weight-for-height, based on a subject's age and gender. The device and method may also provide classification information, such as whether the percentile information is considered to be, for example, below normal, normal, above normal, or far above normal. The device and method may additionally indicate, for example, the normal range of the subject's weight based on the subject's height, the subject's height based on the subject's weight and the normal range of BMI based on the subject's age and gender. In still another aspect, the device and method may indicate predictive values of the subject's future weight, height, BMI or head circumference based on the subject's present measurement values and growth percentiles.