KDP Cover Calculator

Dimension checker

KDP Cover Size Checker

Compare an existing cover file size with the calculated paperback wrap size and catch obvious width, height, bleed, or spine mistakes.

Use the toolRead requirements

Compare your existing file size against the calculated target.

Verified formula assumptions: 2026-07-08

Calculate the paperback wrap

Enter the production settings KDP uses. The output updates the cover size, spine width, SVG guide, and checker target in the browser.

Full width0.000 in
Full height0.000 in
Spine0.000 in

Layout measurements

    Estimates only. Verify the final file with Amazon KDP's official cover calculator and previewer before upload.

    Check an existing cover size

    Enter the document size from Canva, Acrobat, or another design tool. Differences within 0.01 inch are treated as close.

    What this checker can catch

    The checker compares your entered cover width and height with the calculated target size. It can catch common setup mistakes such as missing bleed, front-cover-only documents, or stale spine widths after a page-count change.

    It does not inspect your PDF artwork, fonts, color profile, transparency, or image resolution.

    Use after rejection

    If KDP reports a cover size or bleed error, enter the intended trim, page count, paper type, and the actual file size. The mismatch can point to which dimension needs to be rebuilt.

    Example trim and paper references

    PresetUse case
    5 x 8 inCompact fiction and nonfiction paperbacks.
    5.5 x 8.5 inCommon memoir, fiction, and trade paperback size.
    6 x 9 inPopular trade paperback and low-content book size.
    7 x 10 inWorkbooks, manuals, and larger nonfiction.

    FAQ

    What tolerance does the checker use?

    The browser checker treats differences within 0.01 inch as close. You should still verify with KDP before upload.

    Can it read my PDF automatically?

    Not in v1. This first version checks dimensions you enter manually.