Size Unit Dimensions B0   B1   B2   B3   B4   B5   B6   B7   B8   B9   B10   A Sizes   C Sizes in mm   cm   m   inches   More Units is 250 x 353

# 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.

B Series Paper Sizes Chart.

## Table of Paper Sizes From B0 to B10

B Paper SizeWidth x Height (mm)Width x Height (in)
B01000 x 1414 mm39.4 x 55.7 in
B1707 x 1000 mm27.8 x 39.4 in
B2500 x 707 mm19.7 x 27.8 in
B3353 x 500 mm13.9 x 19.7 in
B4250 x 353 mm9.8 x 13.9 in
B5176 x 250 mm6.9 x 9.8 in
B6125 x 176 mm4.9 x 6.9 in
B788 x 125 mm3.5 x 4.9 in
B862 x 88 mm2.4 x 3.5 in
B944 x 62 mm1.7 x 2.4 in
B1031 x 44 mm1.2 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.

SizeWidth x Height (mm)Width x Height (in)
B1XL750 x 1050 mm29.5 x 41.3 in
B2+530 x 750 mm20.9 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.

SizeWidth x Height (mm)Width x Height (in)
RB01025 x 1449 mm40.4 x 57.0 in
RB1725 x 1025 mm28.5 x 40.4 in
RB2513 x 725 mm20.2 x 28.5 in
RB3363 x 513 mm14.3 x 20.2 in
RB4257 x 363 mm10.1 x 14.3 in
SizeWidth x Height (mm)Width x Height (in)
SRB01072 x 1516 mm42.2 x 59.9 in
SRB1758 x 1072 mm29.8 x 42.2 in
SRB2536 x 758 mm21.1 x 29.8 in
SRB3379 x 536 mm14.9 x 21.1 in
SRB4268 x 379 mm10.6 x 14.9 in