What to check

1. White and standard-color KDP interiors use 0

White and standard-color KDP interiors use 0.002252 inches per page; cream uses 0.0025; premium color uses 0.002347.

2. Do not add spine text below 80 pages

Do not add spine text below 80 pages. Above that threshold, preserve 0.0625 inches of space on both sides.

3. Avoid hard color edges exactly on the fold because binding and trim have production variance

Avoid hard color edges exactly on the fold because binding and trim have production variance.

Use the final production inputs

Calculate from the final formatted page count, not the manuscript estimate. Select the exact trim, binding, interior type, and paper stock before creating the cover sheet. If any of those values change, regenerate the dimensions and compare the exported PDF against the printer's current template.

Artwork, type, spine, and back-cover copy remain editable when the print setup changes.

Sources: Amazon KDP cover preparation. Recheck the current printer template before export.