A unique set of micromechanics equations is presented for high-temperature metal matrix composites. The set includes expressions to predict mechanical properties, thermal properties, and constituent microstresses for the unidirectional fiber reinforced ply. The equations are derived based on a mechanics of materials formulation assuming a square array unit cell model of a single fiber, surrounding matrix, and an interphase to account for the chemical reaction which commonly occurs between fiber and matrix. A preliminary validation of the equations was performed using three-dimensional finite element analysis. The results demonstrate excellent agreement between properties predicted using the micromechanics equations and properties simulated by the finite element analyses. Implementation of the micromechanics equations as part of an integrated computational capability for nonlinear structural analysis of high-temperature multilayered fiber composites is illustrated.