# Dimensions Of B Series Paper Sizes

The dimensions of the B series paper sizes, as defined by ISO 216, are given in the table below in both millimetres and inches (cm measurements can be obtained by dividing the mm value by 10). The B Series paper size chart is a visual explanation of how the B paper sizes relate to each other.

## Table of Paper Sizes From B0 to B10

B Paper Size | Width x Height (mm) | Width x Height (in) |
---|---|---|

B0 | 1000 x 1414 mm | 39.4 x 55.7 in |

B1 | 707 x 1000 mm | 27.8 x 39.4 in |

B2 | 500 x 707 mm | 19.7 x 27.8 in |

B3 | 353 x 500 mm | 13.9 x 19.7 in |

B4 | 250 x 353 mm | 9.8 x 13.9 in |

B5 | 176 x 250 mm | 6.9 x 9.8 in |

B6 | 125 x 176 mm | 4.9 x 6.9 in |

B7 | 88 x 125 mm | 3.5 x 4.9 in |

B8 | 62 x 88 mm | 2.4 x 3.5 in |

B9 | 44 x 62 mm | 1.7 x 2.4 in |

B10 | 31 x 44 mm | 1.2 x 1.7 in |

To obtain sizes in centimetres, convert mm values to cm by dividing by 10 and in feet by dividing inch values by 12. More units here.

## B Series Paper Size Tolerances

ISO 216 specifies tolerances for the production of B series paper sizes in the same way as for A series paper sizes, the specific details of which are as follows:

- ±1.5 mm (0.06 in) for dimensions up to 150 mm (5.9 in)
- ±2 mm (0.08 in) for lengths in the range 150 to 600 mm (5.9 to 23.6 in)
- ±3 mm (0.12 in) for any dimension above 600 mm (23.6 in)

## B Series Paper Sizes Definition

The B series paper sizes are defined in ISO 216 in the following way.

The B series paper sizes were created in order to provide paper sizes that weren't covered by the A series, but also use an aspect ratio of 1:root2. B sizes are defined as size B(n) being the geometric mean of size A(n) and size A(n-1). The Geometric Means of 2 numbers being the square root of the product of the two numbers.

This system gives a useful property for enlarging and reducing documents in that the enlargement from A(n) to B(n) is the same as that from B(n) to A(n-1).

As with the A series paper sizes, the standard lengths and widths are rounded to the nearest millimetre.

## Uncut B Sizes B2+ and B1XL

B2+ and B1XL (Also known as B1+) are oversize/uncut B paper sizes. These are not defined by ISO and have come about due to an industry need. The commonly used dimensions for these sizes are given in the following table.

Size | Width x Height (mm) | Width x Height (in) |
---|---|---|

B1XL | 750 x 1050 mm | 29.5 x 41.3 in |

B2+ | 530 x 750 mm | 20.9 x 29.5 in |

Theoretical sizes for RB (105% of the area of the corresponding B size) and SRB (115% of the area) sizes are given in the following tables.

Size | Width x Height (mm) | Width x Height (in) |
---|---|---|

RB0 | 1025 x 1449 mm | 40.4 x 57.0 in |

RB1 | 725 x 1025 mm | 28.5 x 40.4 in |

RB2 | 513 x 725 mm | 20.2 x 28.5 in |

RB3 | 363 x 513 mm | 14.3 x 20.2 in |

RB4 | 257 x 363 mm | 10.1 x 14.3 in |

Size | Width x Height (mm) | Width x Height (in) |
---|---|---|

SRB0 | 1072 x 1516 mm | 42.2 x 59.9 in |

SRB1 | 758 x 1072 mm | 29.8 x 42.2 in |

SRB2 | 536 x 758 mm | 21.1 x 29.8 in |

SRB3 | 379 x 536 mm | 14.9 x 21.1 in |

SRB4 | 268 x 379 mm | 10.6 x 14.9 in |