Density Functional Theory (DFT) calculations at the B3LYP/6-31G^* level have been performed on four bowl-shaped polyaromatic hydrocarbons of C₃₀H₁₂ molecular formula (1-4) showing C₃ (1), C_2v (2 and 4), and C_2h (3) symmetries. The geometrical and electronic properties of the compounds studied have been analyzed to explain their relative stability. NMR chemical shifts parameters for the atoms and Nucleus Independent Chemical Shifts (NICSs) fr the rings werw calculated using the GIAO method. The ¹³C and ¹H chemical shifts calculated are very good agreement with the experimental data.