8.5 x 8.5 Book on KDP: Size, Spine Width and Print Cost (UK)
Everything for an 8.5 x 8.5 inch (21.59 cm square) KDP paperback: page limits, bleed size, margins, spine width for 24 to 590 pages, and Amazon.co.uk print cost.
The library
Trim Size
Expert articles on KDP formatting, self-publishing, and book design for UK authors. 5 guides and counting.
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KDP Formatting
4 articlesStandard Book Sizes UK: Paperback, Hardback and A5 in mm, cm and Inches
UK book sizes in mm, cm and inches: A-format 111 × 178 mm, B-format 129 × 198 mm, Demy 138 × 216 mm, Royal 156 × 234 mm, A5 148 × 210 mm, and which Amazon KDP size matches each one.
KDP error: Bleed misconfigured for your trim size
Why KDP rejected your book for incorrect bleed — and the exact fix. UK-specific, 2026 spec.
KDP error: Cover dimensions don't match interior trim
Why KDP rejected your book for cover-interior trim mismatch — and the exact fix. UK-specific, 2026 spec.
Tools & Software
1 articleKDP Trim Size Guide — Find the Perfect Size for Your Book
Interactive guide to all Amazon KDP trim sizes. Find which trim size suits your genre with UK-specific examples, bleed options, and a filterable comparison table.