Lap quilts are typically smaller than traditional quilts, making them ideal for use on sofas, chairs, or as a throw blanket. The dimensions of lap quilts vary, but they are generally between 36 inches and 60 inches wide, and between 45 inches and 75 inches long. Some lap quilts may be square in shape, measuring between 36 and 60 inches on each side. When choosing a lap quilt, consider the size of the person who will be using it, as well as the space where it will be used.