What Are the Different Sizes of A3, A4 and A5 Paper?

The dimensions of A3 paper are 11.7 inches by 16.5 inches, or 297 millimeters by 420 millimeters. The dimensions of A4 paper are 8.3 inches by 11.7 inches, or 210 millimeters by 297 millimeters. The dimensions of A5 paper are 5.8 inches by 8.3 inches, or 148 millimeters by 210 millimeters. The dimensions of these paper sizes and the rest of the A series are defined by the international ISO 216 standard.

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