About kdpcover.pro
kdpcover.pro is an independent precision calculator for Amazon KDP paperback and case-laminate hardcover covers. The KDP white-paper paperback spine width formula is 0.002252 inches per page; cream is 0.0025; standard color is 0.002252; premium color and case-laminate hardcover are both 0.002347. Multiply your interior page count by the right multiplier and you have the spine width.
Methodology
Every multiplier and formula was last reconciled against Amazon KDP’s official cover-template generator on . All math runs in your browser; nothing is uploaded. The full set of formulas lives in lib/kdp/calc.ts with full unit-test coverage.
Authoritative sources
- KDP Paperback Cover Creation
- KDP Hardcover Cover Creation
- KDP Trim Size, Bleed & Margins
- KDP Barcode Requirements
- KDP Print Options
- KDP Cover Calculator (template generator)
Common questions about spine width, bleed, trim sizes, and KDP rejections are answered on the KDP cover calculator itself, alongside the live tool.
Contact
Bugs, feature requests, or accuracy reports: hello@kdpcover.pro.