Abstract: A ceramic tile gauge for determining the shape of a space between a fixed tile and an adjacent fixed member and for enabling a tile to be cut to the shape of the space comprises a body member having an abutment surface thereon and a pair of arm members extending rearwardly of the body member. A pair of engagement means are slidably mounted one on each arm member to be selectively and releasably lockable to the arm members whereby, with the abutment surface engaging the fixed member and with the engagement means located and locked in operative positions on the arm members and in engagement with the bounding edge of the fixed tile, the abutment surface and a straight line through the engagement means define opposed edges of the space.