Nowadays, the assessment of body composition by estimating the percentage of body fat has a great impact in many fields such as nutrition, health, sports, chronic diseases and others. The main purpose for this work is to demonstrate the development of a Virtual Instrument that permits more effective assessment of body fat, automatic data processing, recording results and storage in a database, with high potential to conduct new studies.Index Termsvirtual instrument, wireless communication, biomedical equipment, medical diagnosis.