The article presents the performance of cement mortar in compression, split tension, flexure, and shear strengths. The waste stone powder was used as a replacement to cement in the proportion of 0 to 40% with an increment of 5%. From the various replacements, the effective replacement arrived from the maximum compressive strength and for this, with the incorporation of steel and glass fibers, compressive, flexure, and shear strengths evaluated. The mixture of Steel and Glass fibers are added to the cement mortar mixes in the proportion of 1 and 2% by volume of the specimen. From the test results, it is observed that the replacement of stone waste powder is effective at 15%, and the same mix with 2% of fiber mixes showed superior performance on the fundamental properties. The strengths are varied from 12 to 26% when compared with the plane mix. Mathematical models generated for evaluation of strengths with relations to cube compressive strength.