Interactive Cover Geometry Tool

KDP Cover Spine & Barcode Margin Calculator

Amazon rejects paperback covers if spine text wraps over edges or the barcode covers artwork. Adjust your book's parameters below to inspect the live 2D full-wrap diagram, exact spine thickness, and safe zones.

1. Book Specifications

Trim Size (Width × Height)

Page Count: 240 pages Min: 24 · Max: 828

Paper Stock / Interior Type Cream paper has higher caliper/thickness than white paper.

2. Full-Wrap Cover Layout & Margin Guide

Bleed: 0.125" all sides · Barcode: 2.0" × 1.2" · Spine Text Safe Zone: 0.0625"

Spine Width

0.600"

15.2 mm · 43.2 pt

Full Cover Dimensions

12.850" × 9.250"

326.4 × 235.0 mm

Photoshop / Canva (300 DPI)

3855 × 2775 px

Exact canvas resolution

Spine Text Allowed?

✓ Yes (≥130 pgs)

Safe text zone: 0.475"

Spine Thickness Across Different Page Counts

Page Count	White Paper	Cream Paper (Fiction)	Color Paper	Spine Text Safe?

Amazon KDP Cover Rules You Must Know

1. The 130-Page Spine Text Threshold Amazon POD machines mechanically fold covers. On books with fewer than 130 pages, variance in the paper fold can shift text over the crease onto the front or back cover. Amazon's automated scanner will reject any text placed on spines under 130 pages.

2. Barcode Exclusion Zone (2.0" × 1.2") Amazon automatically stamps their ISBN barcode in the lower-right area of your back cover (0.25" from bottom trim, 0.25" from the spine or edge). Never place titles, blurbs, testimonials, author bios, or logos within this 2.0" × 1.2" rectangle.

3. The 0.125" (1/8") Outer Bleed Your wraparound cover PDF must be exactly 0.25" wider (0.125" left + 0.125" right) and 0.25" taller (0.125" top + 0.125" bottom) than the book's trim dimensions. Background artwork must stretch all the way to this outer edge.