Black holes in string theory

String theory is currently the only viable theory of quantum gravity, and comparing its predictions of macroscopic and microscopic black hole entropy is one of the tests of its validity. In this work, methods are established for calculating macroscopic black hole entropies in low energy effective theories of string theory compactifications. Entropies for four and five dimensional static and rotating black holes, and effects of changing compactification parameters and higher order corrections are reported.