Enter the page count and paper caliper to get the spine width for your cover file.
Estimated spine: 10.00 mm
Actual results depend on stock and binding method.
Every sheet (leaf) carries two pages, so spine width = (pages ÷ 2) × caliper per leaf. A 200-page book on 0.1 mm paper has a 10 mm spine. Add a little for the cover stock and glue if your printer doesn't already include it.
Caliper varies a lot between papers of the same weight, so use the printer's own caliper figure, or their spine calculator, for the final cover file.
Divide the page count by two and multiply by the paper thickness per leaf. For example, 300 pages ÷ 2 × 0.1 mm = 15 mm.
Caliper is the thickness of one sheet, usually given in mm, microns or points (thousandths of an inch).
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