Notebook Sizes Guide

Notebook Sizes Guide
When you start to look for your own notebook for school or a journal for recording, you will find that there is much to learn before you can actually get a perfect one. The first thing you come across may be the notebook sizes. It is confusing by A4, A5, B4, B5 and many other notebook sizes. It is hard for someone to imagine how large an A4 journal is.
I mean, who can ever tell the sizes from the combination of only one letter and one number? Who makes the standard?
So we are making this guide for notebook sizes with measurement of its length and width, sizes comparison.

A Series Notebook Size Standard
A series paper is an international standard paper size, defined by the ISO International Standards Organization. Papers in A series are based on finding a paper with an aspect ratio of 1:2 and an area of ​​1 square meter, and numbering it as A0. By folding A0 paper in half along the long edge, paper sizes such as A1, A2, and A3 can be obtained. ‌Its main feature is that the aspect ratio of each paper size is 1:2, so any two adjacent sizes can be obtained by folding a large paper in half along the long side. This design allows the paper to maintain the same proportion when scaling between different sizes, making it more convenient for design and printing.
The size of A4 paper is 210mm×297mm‌. A4 is one of the most commonly used specifications in the A series of notebooks.
‌The size of A5 paper is 148mm×210mm
The size of A6 paper is 105mm x 148mm‌
‌The size of A7 paper is 105mm x 74mm‌
‌The size of A8 paper is 52mm×74mm
‌The size of A9 paper is 37mm×52mm
‌The size of A10 paper is 26mm x 37mm‌

B Series Notebook Size Standard
‌The specifications of B series paper are based on ISO 216 standard, from B0 to B10, where B0 is the largest size and B10 is the smallest size. Each B series paper size is half of the previous one, and is often used in commercial advertisements, posters, brochures, etc. ‌B0 size is 1000mm × 1414mm, B1 size is 707mm × 1000mm, B2 is 500mm × 707mm, B3 is 353mm × 500mm, B4 is 250mm × 353mm, B5 is 176mm × 250mm, and so on. ‌
The ratio of B series paper is 2:1, which means that the width of each size of paper is 2 times the length. For example, the size of B4 paper is 250mm × 353mm, and its area is 2 times that of B5 paper.
The size of B5 paper is 176mm × 250mm
The size of B6 paper is 125mm×176mm
The size of B7 paper is 88mm×125mm

Size Chart

Please note that there can be slight difference between the IOS standard and real made paper.