KDP Paperback vs Hardcover: Exact Spine Width, Bleed & Dimensions

Publishing both paperback and hardcover editions of your book can boost royalties by up to 60%. Hardcovers make premium gifts and command price points of $16.99 to $24.99. However, hardcover cover specifications differ drastically from paperbacks due to the physical cardboard wrap-around. Here is what you need to know.

1. The Case Laminate Wrap (Bleed Difference)

For a **Paperback**, Amazon requires a **0.125" (3.2 mm)** bleed on all outer edges. For a **Hardcover**, because the printed paper must fold around thick cardboard boards, Amazon requires a massive **0.59" (15 mm)** wrap-around margin on all four sides! If you submit a paperback cover file for a hardcover edition, it will fail review immediately.

2. Spine Width Differences

Hardcovers require a wider hinge score allowance than softcover books. - Paperback spine width = Page count × Paper thickness factor. - Hardcover spine width = (Page count × Paper thickness factor) + board thickness hinge allowance (0.06" to 0.12").

3. Minimum Page Count Limits

• **Paperback**: Can be printed starting at just 24 pages.
• **Hardcover**: Requires a minimum of **72 pages** (maximum 550 pages) to support mechanical case binding.

4. Automated Cover Resizing with KDPage

Never struggle recalculating inches and millimeters manually. Use the KDPage Spine & Cover Calculator at kdpage.com/tools/spine-calculator to instantly toggle between Paperback and Hardcover specs with exact pixel and millimeter measurements.