The typical size of a United States postage stamp is .87 inches by 98 inches when printed as part of a booklet. The size of a stamp can vary if it is produced as part of a roll or as a commemorative piece.
Postage stamps produced in a booklet feature images that are .73 inches by .84 inches. The image can be vertically or horizontally orientated depending on the image used. Booklets are generally double-sided and feature adhesive stamps. Commemorative stamps are available in many different varieties and are generally available in a roll or as a single piece. The size of commemorative stamps varies for each piece.