ISO Paper Sizes

International Standard (ISO 216)

ISO 216 is a metric format and has been adopted by all countries in the world, except the United States and Canada. Although Mexico and the Philippines have officially adopted the ISO 216 standard, the “letter” format is still common.

‘A’ Series – ISO Paper Sizes

The A series consists of a logical set of paper sizes that are defined by the ISO 216 standard. The largest size (A0) measures one square meter. This series is based on each size being half of the size of the previous one, when folded parallel to the shorter lengths.

Sizes | Width x Height (mm) | Width x Height (in) |

A0 | 841 x 1189 | 33.11 x 46.81 |

A1 | 594 x 841 | 23.39 x 33.11 |

A2 | 420 x 594 | 16.54 x 23.39 |

A3 | 297 x 420 | 11.69 x 16.54 |

A4 | 210 x 297 | 8.27 x 11.69 |

A5 | 148 x 210 | 5.83 x 8.27 |

A6 | 105 x 148 | 4.13 x 5.83 |

A7 | 74 x 105 | 2.91 x 4.13 |

‘B’ Series – ISO Paper Sizes

The B series paper sizes provide paper sizes that are not covered in the A series. The same logic from the A sizes also applies for the B series.

Sizes | Width x Height (mm) | Width x Height (in) |

B0 | 1028 x 1456 | 40.48 x 57.32 |

B1 | 707 x 1000 | 28.66 x 40.48 |

B2 | 514 x 728 | 20.24 x 28.66 |

B3 | 364 x 514 | 14.33 x 20.24 |

B4 | 257 x 364 | 10.12 x 14.33 |

B5 | 182 x 257 | 7.17 x 10.12 |

B6 | 128 x 182 | 5.04 x 7.17 |