Abstract: A caulking guide for allowing a user to easily apply a smooth, straight bead of caulk having a predetermined width. The device includes a flat, bendable but rigid substantially T-shaped plate. The plate includes an elongated portion and a substantially rectangular leg perpendicular thereto and integral therewith. The elongated portion has one or more retaining bands thereon for receiving and surrounding a caulking tube dispensing nozzle. Along a longitudinal outer edge of the applicator tip are a plurality of measurement indicia to allow a user to select a dispensing opening having a desired width. Opposing side edges of the applicator tip may be folded to a substantially vertical position with the fold lines formed at the measurement indicia corresponding to the dimension desired for the dispensing opening. Accordingly, the substantially rectangluar shaped opening formed by folding the device allows a user to apply a smooth and straight joint having a preselected width.