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A4 Paper Size in cm, mm and Inches, Plus the Envelopes That Fit A4

The A4 paper size is 210 x 297mm, which is 21 x 29.7cm or about 8.27 x 11.69 inches. A4 is half of A3 and twice the size of A5. A C4 envelope takes an A4 sheet flat, a C5 envelope takes it folded once, and a DL envelope takes it folded into thirds. A standard ream holds 500 sheets.