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Amazon KDP authors fixing paperback and hardcover interior upload warnings

KDP Interior Margin Gutter Calculator

Calculate KDP inside gutter, outside margins, bleed page size, and safe text area.

Instructions: Enter your values, review the instant result, then sign up to save the tool.

Minimum inside gutter

Enter values to see the result.

Instructions

  1. Enter the numbers or text for your situation.
  2. The result updates instantly in your browser.
  3. Sign up to save this tool to your favorites.

Good for

KDP Interior Margin Gutter

Use this tool when you need a quick answer for kdp margin gutter calculator. Enter your details, compare the result, and adjust the inputs until the numbers match your situation.

Use it well

  • Use the final formatted PDF page count because the gutter changes at KDP's page-count breakpoints.
  • Set mirror margins in your layout software so inside and outside margins land on the correct side.
  • Choose bleed only when artwork or backgrounds intentionally run to the page edge.

Quick guide

How to use this before exporting an interior PDF

KDP interior uploads fail when trim size, bleed, page count, gutter, and outside margins do not match the PDF. Run the final specs before re-exporting from Word, InDesign, Canva, Atticus, or Vellum.

  1. Enter the trim size selected in KDP and the final formatted page count.
  2. Choose whether the interior has bleed, meaning artwork or backgrounds run to the edge.
  3. Compare your planned top, bottom, and outside margins with KDP's minimums.
  4. Use the minimum inside gutter as both inside margin and gutter when your software separates those fields.
KDP Paperback Cover SizeKDP Print RoyaltyKDP Ebook Royalty

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Free KDP Interior Margin Gutter: Calculate KDP inside gutter, outside margins, bleed page size, and safe text area.

Sources and freshness

Sources checked 2026-08-01

Amazon KDP publishes minimum inside gutter margins by page count, outside margin rules for bleed and non-bleed interiors, and bleed page-size additions. Confirm the final PDF in KDP Previewer before publishing.

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Use this KDP interior margin gutter calculator before uploading a paperback or hardcover manuscript. Enter trim size, final page count, bleed setting, and planned margins to get the minimum inside gutter, outside margin, bleed PDF dimensions, safe text width, safe text height, and any margin adjustment needed to avoid KDP preview errors. Helpful for kdp margin gutter calculator, kdp interior margin gutter, online kdp interior margin gutter, ecommerce calculator, quick estimate, planning tool, browser tool, and practical everyday comparisons.