Folio Calculator

Sheet layout for different folio sizes (quarto, octavo, etc.).

Parent sheet height (mm)

Parent sheet width (mm)

Fold type

Total pages needed

Tab to move between fields

Trimmed page height (mm)

142.5

Trimmed page width (mm)

207

Page height (inches)5.61

Page width (inches)8.15

Pages per sheet16

Sheets needed8

Untrimmed leaf height (mm)148.5

Untrimmed leaf width (mm)210

Waste pages0

Aspect Ratio0.69%

How to Use This Calculator

Enter the height and width of the unfolded parent sheet in millimeters (e.g., 594 × 420 mm for A2).
Select the fold type: folio (4 pages), quarto (8), octavo (16), duodecimo (24), or sextodecimo (32).
Enter the total number of pages needed in the finished book.
Read the trimmed page height and width in mm and inches — these are the final leaf dimensions after folding and trimming.
Note the number of parent sheets needed and any waste pages added to complete the last signature.
Use the pages per sheet output to verify your imposition layout before printing.

How the result changes with Parent sheet height (mm)

Parent sheet height (mm): Height of the unfolded parent sheet in mm (e.g., 594 for A2).
Parent sheet width (mm): Width of the unfolded parent sheet in mm (e.g., 420 for A2).
Fold type: 1 = Folio (4pp), 2 = Quarto (8pp), 3 = Octavo (16pp), 4 = Duodecimo (24pp), 5 = Sextodecimo (32pp).
Total pages needed: Total number of pages in the finished book.

Identify Input Parameters
4 parameters
Parent sheet height (mm) = 594, Parent sheet width (mm) = 420, Fold type = 3, Total pages needed = 128 = 4 input(s) provided
Calculate Trimmed page height
Trimmed page height = sheetHeightMm / fold.heightDivisor
142.5 = 142.5
Calculate Trimmed page width
Trimmed page width = sheetWidthMm / fold.widthDivisor
207 = 207
Calculate Page height
Page height = trimmedHeight / 25.4
5.61 = 5.61
Calculate Page width
Page width = trimmedWidth / 25.4
8.15 = 8.15