Spine Calculator Perfect Bound Book Spine Width Calculator Select the paper type that you want to use for your inside text pages and then enter in the total number of inside text pages that your book has to determine the final width you need to design your cover spine artwork at. Inside Text Pages Paper Type(Required)60lb Smooth20lb Plain White28lb Premuim White50lb Book Text80lb Book Text20lb Bond Coloured50lb Book Text is the Print Shop standard for perfect bound books.Number of pages(Required)The number of folio text pages your book contains. (Excluding cover pages).Spine Thickness (In inches)The width, in inches, that you should design your cover spine artwork. Δ