<p>The Academic Index calculator on CC is a generic one that can be used for all ivy league schools. According to the Common Data sets of Dartmouth, Brown, UPenn, Cornell, Yale, and Princeton: rank is considered “Very Important” or “Important.” So, for those school’s a student should enter their rank. As Harvard doesn’t consider rank, student’s should use their GPA. (Columbia doesn’t release their CDS, so I don’t know if rank is consider there.)</p>