Electronic absorption spectra of 1-to-10-ring PAHs in cata-condensed form in neutral, cationic, and anionic states, computed in the gas phase at the B3LYP/6-311++G(d) level of theory. The shaded teal region indicates the wavelength range of the interstellar UV extinction bump at 2175 Å, allowing comparison with the calculated π→π absorption features of PAHs. The dotted vertical line marks the central position of the UV extinction feature.