A3 Paper Size Dimensions

A3

297 × 420 mm

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An A3 piece of paper measures 297 × 420 mm or 11.7 × 16.5 inches. Cutting it in half will create two A4 sheets of paper. An A3 piece of paper will fit into a C3 envelope. When folded in half, it will fit into a C4 envelope. A3 is part of the A series and is defined by the ISO 216 international paper size standard.

All A Series Paper Sizes →

A0 841 × 1189 mm A1 594 × 841 mm A2 420 × 594 mm A3 297 × 420 mm A4 210 × 297 mm A5 148 × 210 mm A6 105 × 148 mm A7 74 × 105 mm A8 52 × 74 mm A9 37 × 52 mm A10 26 × 37 mm A11 18 × 26 mm A12 13 × 18 mm A13 9 × 13 mm 2A0 1189 × 1682 mm 4A0 1682 × 2378 mm A0+ 914 × 1292 mm A1+ 609 × 914 mm A3+ 329 × 483 mm