Summary: This study presents the buckling analysis of radially loaded solid circular plate made of functionally graded material. The edge of the plate is either simply supported or clamped, and the plate is assumed to be geometrically perfect. The equilibrium and stability equations, derived through variational formulation, are used to determine the prebuckling forces and critical buckling loads. The equations are based on Love-Kirchhoff hypothesis and on Sanders nonlinear strain-displacement relation. The results are verified with known results in the literature.