A tool and method for marking dimensions for cutting a tile include a platform with a front wall defining an x axis, a side wall defining a y axis, with the y axis being perpendicular to the x axis, and a front guideline defining an x1 axis parallel to the x axis. Also included are a plurality of telescopic fingers which are manually extendable, in parallel with the y axis, to releasably retained protracted positions. The platform is configured for superposed alignment with an installed tile adjacent to an area with an obstruction, and also for adjacent alignment with a loose tile to be cut. Distal ends of protracted fingers indicate points on the surface of the loose tile for marking guidemarks demarcating dimensions for cutting the loose tile.