IMCPro

The body mass index (BMI/IMC), or Quetelet index, is a heuristic proxy for human body fat based on an individual's weight and height. BMI does not actually Measure the percentage of body fat.
Show your position in a graph.
Enter your weight and height using metric measures.

http://itunes.apple.com/br/app/imcpro/id495557257?mt=12