Most plywood comes in a 4-foot by 8-foot sheet. Other common sizes include 5 feet by 5 feet, 4 feet by 10 feet, and 4 feet by 12 feet.
Standard plywood is cut into sheets that measure 4 feet by 8 feet. This type of sheet is generally 1/4 inch to 1 1/4 inches thick. Baltic birch wood and other hardwood plywoods are often cut to 5 feet by 5 feet. Melamine wood often is cut to be oversized. This wood is 1 inch larger on every side. OSB plywood can be cut to sheets that are up to 24 feet long.