Abstract: The present invention is an extensible carpenter's level that is adjustable between a collapsed position and a fully-extended position. The level may be manufactured in a variety of sizes. An exemplary embodiment of the level is comprised of an innerslide and two outerslides. The innerslide has two sets of tracks or tongues. Each of the outerslides is slidably connected to the innerslide. In particular, one outerslide is adapted to slide along one set of tracks or tongues, and the other outerslide is adapted to slide along the other set of tracks or tongues. At least one of the slides includes at least one level bubble. The level preferably includes multiple level bubbles to enable a variety of measurements, e.g., a horizontal level, a vertical level, and a 45° level.