Why did KDP reject my cover dimensions?
KDP can reject a cover when the uploaded PDF does not match the expected full cover size or when artwork intended to bleed does not extend beyond trim.
Use the numbers from your actual job
The guide explains the decision; the linked calculator gives you the value for your own file or production assumptions.
Use the provider-controlled final specification
Book dimensions depend on final page count, trim, paper/interior choice and current provider rules. Recalculate after any change that affects pagination or cover geometry.
Apply the answer to this specific question
KDP can reject a cover when the uploaded PDF does not match the expected full cover size or when artwork intended to bleed does not extend beyond trim. The practical consequence should be checked with KDP Cover Size Checker, PDF Preflight Inspector when your own dimensions, page count, cost or production values differ from the example implied by the question.
What commonly changes the result
For “Why did KDP reject my cover dimensions?”, the most important variables are the ones represented by the linked calculator and any provider-controlled specification. A correct arithmetic result can still be unsuitable if the source dimensions, category, page yield, trim, bleed, margin or production method were assumed incorrectly.
A better verification workflow
For Why did KDP reject my cover dimensions?, record the source measurement or controlling specification first, then run the real job values through kdp cover size, pdf preflight inspector. Keep the result with the job notes, compare it with the physical file or material, and recheck any provider-controlled rule immediately before production or upload.
Practical answer
KDP can reject a cover when the uploaded PDF does not match the expected full cover size or when artwork intended to bleed does not extend beyond trim.
When the decision affects a paid print run, book upload, client order or expensive material, keep the calculation with the job notes and verify any external specification again immediately before production.