The expected performance of the ATLAS inner detector

The ATLAS experiment is a general purpose detector designed to exploit the discovery potential of the Large Hadron Collider (LHC) at CERN, which will provide proton-proton collisions at a center of mass energy of 14 TeV. The Inner Detector will see of the order of 1000 charged particle tracks for every bunch crossing at the design luminosity of the LHC. A summary of the expected performance for reconstructing single particles is presented, along with some measures of the vertex resolution of the vertexing capabilities. The studies focus on the performance expected for the initial running at the start-up of the LHC.