  Perfect fractals are mathematical objects that, because they are generated by
recursive processes, have self-similarity and infinite complexity. In
particular, they also have a fractional dimension. Although several proposals
for the study of fractals at the basic level are present in the literature,
only few proposals for the study of real fractals exist, which does not seem
reasonable in our point of view considering the wealth of the theme and its
potentiality as interdisciplinary theme in math education. For this reason, in
this text, we present a simple and easily assimilable method to calculate the
fractal dimension of any two-dimensional object. The method is divided into two
steps. In the first step, students learn how is calculated the fractal
dimension of any figure and they do this manually. Next part, which according
to our best knowledge is new, with respect to the application in classroom,
consists in the procedure of determining the fractal dimension using a
smartphone and a computer with free software \textit {imageJ} installed. This
proposal is easily understandable, considering the high school curriculum, and
readily replicable, considering its easy adaptation to the most diverse school
realities.
