Book spine width calculator
Page count + paper type → the spine width your cover wrap needs.
OONA · Spine width
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pages
KDP factors: cream 0.0025″/page · white 0.002252″/page · color 0.002347″/page — the same numbers our cover engine uses for wraps. Amazon only prints spine text on books of 79 pages or more, and the text needs 0.0625″ clearance each side.
Don't measure it at all: Cover Maker builds the full
paperback wrap — back, spine, front — at the exact size for your page count and trim,
ready to upload to KDP. Same account as Book Maker, which quotes
this spine number automatically when it builds your print PDF.
