The format determines the size of the sheet in the notebook and, accordingly, its dimensions in length and width. Here, the standard clerical designation with letter "A" with a number is traditionally used. Nowadays, there are such options:
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A3. The largest of the formats used in modern notebooks: A3 sheet size is 420x297, or twice the A4 (see below). Such products usually do not have a leaflet (see below) and are more like sketchbooks than notebooks in the regular sense of the word; accordingly, they are intended mainly for artists.
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A4. A format known as the "standard landscape sheet"; the actual dimensions are 297x210. Despite the general popularity, it is quite rare among notebooks: a product of such dimensions is not compact, and it is not very convenient to carry. Such notebooks are designed primarily for those who need "space" for notes or sketches.
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A5. Such a sheet is half the size of A4, its dimensions are 210x148 mm. It is one of the most common in modern notebooks, as it offers a good compromise between compactness and space for writing/drawings.
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A6. A sheet corresponding in size to a quarter of a landscape (A4) — its dimensions are 148x105 mm, which is comparable to a standard photo and makes it easy to carry a notebook in your pocket. At the same time, there is not much space on t
...he sheet, respectively. It is worth paying attention to such products if compactness and ease of carrying play a decisive role.
— A7. The most compact of the formats found in modern notebooks is half the size of an A6 sheet, 105x74 mm in size. Such a sheet is very tiny and requires saving space while recording; on the other hand, an A7 notebook will fit in almost any pocket without any problems.
Note that it is not about exact compliance with the formats — usually, the actual dimensions of the notebooks may differ slightly from the accepted standard. However, in general, this parameter quite allows you to navigate in size.
