Anthropometry is widely recognized as an important method in the evaluation of dysmorphic children. Nevertheless, it has never gained widespread clinical use. We believe that this has mainly practical reasons: appropriate growth charts are not readily available at the bedside or in clinic and taking multiple measurements and plotting them into corresponding growth charts is a time-consuming task. Here we describe a computer program that overcomes both problems: ABase compares entered anthropometric measurements to a database of age- and sex-matched reference values, calculates the centile rank and displays the result either as text or as a digitized growth chart. The program runs on small handheld computers that can easily be carried around in a shirt pocket.