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An exact finite strip for the buckling and initial post-buckling analysis of moderately thick plates is presented in this paper using first order shear deformation theory (FSDT). In the buckling phase the equilibrium Von-Karman's equation is solved exactly to obtain out-of-plane mode shapes and critical loads. The Von-Karman's compatibility equation is solved exactly in the post-buckling phase with the assumption that the deflected form immediately after buckling is the same as that obtained for the buckling. The principle of minimum potential energy is invoked to solve for the unknown coefficients in the assumed out-of-plane deflection and rotation functions.