Book Sizes on publishing.co.uk — Professional KDP Book Formattinghttps://publishing.co.uk/tags/book-sizes/Recent content in Book Sizes on publishing.co.uk — Professional KDP Book FormattingHugoen-gbWed, 30 Sep 2026 00:00:00 +0000Standard Book Sizes UK: Paperback, Hardback and A5 in mm, cm and Incheshttps://publishing.co.uk/guides/standard-book-sizes-uk/Wed, 30 Sep 2026 00:00:00 +0000https://publishing.co.uk/guides/standard-book-sizes-uk/<p><strong>Short answer:</strong> the standard UK book sizes are <strong>A-format 111 × 178 mm</strong>, <strong>B-format 129 × 198 mm</strong> and <strong>Demy 138 × 216 mm</strong> for paperbacks, and <strong>Demy</strong>, <strong>Royal 156 × 234 mm</strong> or <strong>Crown Quarto 189 × 246 mm</strong> for hardbacks and larger non-fiction. <strong>A5 is 148 × 210 mm.</strong> If you publish on Amazon KDP you choose in inches, and three KDP sizes are the UK formats to within half a millimetre. The table shows which.</p>