what size is a standard piece of paper

In the United States and Canada, the most common paper size is letter-sized paper, which is 8.5 inches by 11 inches. This is the standard for everyday office print-outs and academic documents. Legal size paper is also commonly used, which is 8.5 inches by 14 inches. Other paper sizes used in the United States include tabloid (ledger), which is 11 inches by 17 inches, and junior legal, which is 8 inches by 5 inches. In the international system, known as the ISO 216 standard, the most commonly used paper size is A4, which measures 8.25 x 11.75 inches, or 210 x 297 mm.