  We studied the band gap of {\beta}-PtO2 using first-principles calculations
based on density functional theory (DFT). The results are obtained within the
framework of generalized gradient approximation (GGA), GGA+U, GW and the hybrid
functional method. For different types of calculations, the calculated band gap
increases from ~ 0.46 eV to 1.80 eV. In particular, the band gap by GW
(conventional and self-consistent) calculation shows a tendency of converging
to ~ 1.25 \pm 0.05 eV. Effect of the on-site Coulomb interaction on the bonding
characteristics is also analyzed.
