KDP Hardcover Cover Planner
Enter trim size and the spine width supplied by the official KDP cover calculator to see the total wrap canvas and protected hinge/safe zones.
Plan the wrap canvas around KDP’s official spine width
Use the final trim size and paste the spine width from Amazon KDP’s official cover calculator/template. The workspace then visualizes the wrap, boards, spine and hinge protection without reverse-engineering a provider-controlled spine formula.
Waiting for real job values
Enter trim dimensions and the official KDP spine width.
Use the official template to supply the spine
InkyValley uses the current hardcover wrap/hinge/content boundaries to explain the layout, but deliberately asks for the spine width from KDP’s official cover calculator/template. That prevents a provider-controlled dimension from being reverse-engineered from an outdated assumption.
What the result is useful for
Useful for translating the official KDP template dimensions into an understandable cover layout before design/export.
How the calculation works
The planner adds KDP’s published wrap around the outside cover and shows the published hinge and safe-placement distances around the visible covers.
What this calculator cannot know
KDP controls final hardcover geometry. Use the official cover calculator/template for the exact spine and final provider dimensions; this tool deliberately does not reverse-engineer an unpublished spine formula.