Page count in, exact spine width and full-wrap cover size out. The numbers your cover designer asks for.
Spine width
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Spine in mm
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Full wrap size
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Wrap in mm
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Wrap includes 0.125" bleed on every outside edge. Spine text needs roughly 0.0625" clearance each side, so KDP only allows spine text at about 80+ pages. Rates config last reviewed 2026-07; always match against KDP's cover template before you upload.
Generated live from the numbers above: red is the bleed zone that gets trimmed, dashed blue is your safe zone for text and important art, and the yellow box is where Amazon prints the barcode. Drop the PNG into your design file at 300 DPI, or use the SVG in vector tools.
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