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A4 paper is a part of the A series of paper sizes, which is commonly used throughout. Defined by the ISO 216 standard, the A-series paper size consists of 13 specific paper sizes:

4A0 – 1682 x 2378 mm

2A0 – 1189 x 1682 mm

A0 – 841 x 1189 mm

A1 – 594 x 841 mm

A2 – 420 x 594 mm

A3 – 297 x 420 mm

A4 – 210 x 297 mm

A5 – 148 x 210 mm

A6 – 105 x 148 mm

A7 – 74 x 105 mm

A8 – 52 x 74 mm

A9 – 37 x 52 mm

A10 – 26 x 37 mm