International paper sizes are defined by the ISO 216 standard, which is used in most countries outside of North America. Here are the most common international paper sizes:1. **A Series:** - **A0:** 841 x 1189 mm (33.1 x 46.8 in) - **A1:** 594 x 841 mm (23.4 x 33.1 in) - **A2:** 420 x 594 mm (16.5 x 23.4 in) - **A3:** 297 x 420 mm (11.7 x 16.5 in) - **A4:** 210 x 297 mm (8.3 x 11.7 in) - **A5:** 148 x 210 mm (5.8 x 8.3 in) - **A6:** 105 x 148 mm (4.1 x 5.8 in) - **A7:** 74 x 105 mm (2.9 x 4.1 in