Macro-elements are one of the powerful means in reducing number of equations to be solved in the finite element analyses. Especially when high order finite elements are used. This is because one Macro-element will represent many finite elements. In this paper a cubic macro-element for the analysis of plates under bending is developed. Implementations of the macro-elements in the analyses showed reduction in number of equations and excellent results were achieved. This new developed macro-element was tested and the results were compared with the results of conventional plate bending finite element solutions and with closed form solution if available.