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This article contains empirical equations for the K _I , K _II , and K _III stress intensity factors (SIFs) for semi-elliptical surface cracks for brittle materials subjected to rolling contact fatigue (RCF) as a function of the contact patch diameter, angle of crack to the surface, max pressure, position along the crack front, and aspect ratio of the crack. The equations were developed from SIFs calculated by parametric three-dimensional (3D) finite element analysis (FEA) for a range of contact patch radii (1b, 2b, and 3b) and angles of the crack to the surface (0°, 45°, and 60°). Calculating mixed-mode SIFs for surface cracks subject to RCF using 3D FEA is computationally complex because of extreme mesh refinement required at multiple levels to capture steep stress gradients. The comprehensive empirical curve fits presented are accurate to within 0.5% of FE simulations and …