The objective of this study is to analyze the buckling behavior of oblique panel elements under independent compressive loads, with simple and fixed supports along edges, using the energy method. The calculation process of the buckling resistance based on the energy method can be complex. Therefore; simple design formulae for the buckling coefficient were proposed. Furthermore, a correlation between biderectional compressive forces is invested for the buckling resistance. Since this correlation is affected by changes in buckling mode, attention must be required in the designing panels.