Thread Length Binding Calculator

Calculate how much sewing thread you need for Coptic, Japanese stab, kettle stitch, and long stitch bookbinding.

Inputs

Book height (mm)

Number of signatures

Binding style (1-4)

Sewing stations

Tab to move between fields

Results

Thread needed (cm)

244

Thread needed (meters)2.44

Thread needed (feet)8

Per signature (cm)26.5

Signatures8

Thread needed (inches)96

Style NameKettle Stitch (Link Stitch)

How to Use This Calculator

Enter the finished book height in millimeters.
Enter the total number of signatures (folded sections) in the book.
Select the binding style: Coptic, Japanese stab, kettle stitch, or long stitch — each uses thread differently.
Enter the number of sewing stations (holes) per signature.
Read the total thread needed in cm, meters, and feet including the 15% safety margin.
Cut your thread to the calculated length before starting to sew to avoid running out mid-section.

How the result changes with Number of signatures

Number of signatures	Thread needed (cm)
21	603
71	1,983
130	3,611
180	4,991

What each input means

Book height (mm): Height of the finished book in millimeters.
Number of signatures: Number of signatures (folded sections) in the book.
Binding style (1-4): 1 = Coptic, 2 = Japanese stab, 3 = Kettle stitch, 4 = Long stitch.
Sewing stations: Number of sewing holes per signature.

What each result means

Thread needed (cm): Total thread length including 15% safety margin.
Thread needed (meters): Thread length in meters for purchasing.
Thread needed (feet): Thread length in feet.
Per signature (cm): Average thread consumed per signature.
Signatures: Number of signatures entered.
Thread needed (inches): Thread length in inches.

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Book height (mm) = 210, Number of signatures = 8, Binding style (1-4) = 3, Sewing stations = 4 = 4 input(s) provided
Calculate Thread needed
Thread needed = withSafety / 10
244 = 244
Calculate Thread needed
Thread needed = withSafety / 1000
2.44 = 2.44
Calculate Thread needed
Thread needed = threadInches / 12
8 = 8

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