According to the size, folio is usually divided into three types: large format, medium format and small format. For 787× 1092 paper, 12 format is large format, 16 ~ 36 format is medium format, and 40 format is small format, but books with mainly characters are generally medium format. Folio shapes are rectangles with different proportions except 6 quarts, 12 quarts, 20 quarts, 24 quarts and 40 quarts, which are suitable for books with different properties and uses.
Normal (domestic standard) paper: 787× 1092mm.
Number of openings (positive degree) Size unit (mm)
Fully open 78 1× 1086
2 Quarts 530×760
362×78 1
4 quarto 390×543
6 quarts 362×390
8 kai271× 390
16 195×27 1
Wide and thick (international standard) paper: 850× 1 168mm.
Open number (measurement) Size unit (mm)
Fully open 844× 1 162
2 kai581× 844
3 quarts 387×844
4 quarto 422×58 1
6 quarts 387×422
8 quarts 290×422
Note: finished product size = paper size-trimming size