Estimate document thickness
Physical sheets × paper caliper, plus covers and extra inserts, gives the estimated stack. Direct measurement overrides the estimate.
stack = sheets × paper caliper + covers + insertsPrint finishing specification tool
Wire-O Binding Size Calculator
Estimate document thickness, select a standard Wire-O element, and plan punch loops and equal end margins before ordering binding wire.
Sizing model reviewed against Wire-O manufacturer charts and machine documentation Updated 2026-08-11
Document inputs
Measure the finished book block
For production work, clamp and measure one complete sample including covers, tabs and inserts. Page-count estimates depend on the actual paper caliper.
Recommended binding element
5/16 in7.9 mm Wire-O
- Document thickness
- 5.6 mm
- Wire pitch
- 3:1
- Physical sheets
- 50
- Loops per book
- 34
- Equal end margin
- 8.8 mm
- Elements needed
- 1
- Total nominal wire length
- 287.9 mm
- Remaining stack capacity
- 0.6 mm
Punch plan
Check the punch pattern and fit
Nearby standard sizes
The selected size and neighboring elements make it easier to check stock availability or choose a compatible machine.
| Wire size | Diameter | Pitch | Maximum stack | Status |
|---|
Verify before ordering
- Measure a finished sample whenever the paper, coating, lamination, tabs or covers change.
- Confirm that the punch and closer support the recommended pitch and wire diameter.
- Run a bound sample and check page turning, closure and end margins before the full production run.
How the calculation works
Select the first standard size that fits
The calculator uses the recommended maximum book thickness table from the James Burn WOB3500 manual and chooses the smallest compatible element in the requested pitch.
Calculate loops and margins
Pitch is converted to loop spacing. The usable binding edge is divided into whole intervals, then the remaining space is centered at both ends.
spacing = 25.4 ÷ pitch; loops = floor(usable edge ÷ spacing) + 1Wire-O sizing references
Wire-O sizing FAQ
What Wire-O size fits a 6 mm document?
The James Burn table recommends a 5/16 inch (7.9 mm) 3:1 element for a book block up to 6.2 mm. Confirm with a finished sample and your machine.
When does Wire-O change from 3:1 to 2:1 pitch?
The referenced chart uses 3:1 through 9/16 inch and 2:1 from 5/8 inch upward. Your punch and closer must support that pitch.
Should I enter pages or sheets?
Enter printed pages and choose duplex or single-sided. The calculator converts pages to physical sheets before applying paper caliper.
Why should I measure the finished stack?
Paper caliper, toner, coating, lamination, tabs and covers all affect thickness. A complete sample is more reliable than a generic sheets-per-millimeter assumption.
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