KDP Cover Dimensions and Spine Width, Calculated
Same book, same page count: cream paper makes the spine 1.4 mm wider than white. The four numbers KDP decides for you, and the paper table that trips people up.
7 min read
ReadEditorial & KDP Intelligence
All posts
Real KDP market data, not the usual advice.
All posts
ACOS vs TACoS: The Amazon Ads Number That Decides
A 30% ACOS can be profitable on an eBook and a loss on a paperback. How to compute your real break-even ACOS, and why TACoS is the number that rules.
5 min read
ReadKDP Title and Subtitle: The Median Is 73 Characters
Nearly four in five books that sell on amazon.com carry a subtitle. Why it is your eighth keyword and how to write it before you publish.
5 min read
ReadSelling Books With Under 10 Reviews: What the Data Says
One in fourteen books with sales signal on amazon.com has fewer than 10 reviews. Why reviews are not a binary gate, and what to work on instead.
5 min read
ReadKindle eBook Pricing: What Books That Sell Actually Cost
The median price of a Kindle book with sales signal on amazon.com is $4.99, not $9.99. Where the 70% royalty band sits and how to price against data.
6 min read
ReadHow to Monitor Competitor Reviews on KDP
Amazon will not notify you when a competitor receives reviews criticizing their formatting or weak ending. Track their ASIN in Markfolio to identify actionable reader patterns the moment they appear.
4 min read
ReadKDP Royalties: 35% vs 70%, the Decision That Costs You Money
The price you set in KDP crosses the 35%/70% royalty threshold and determines whether KDP Select pays off. The real math, including the 20% rule few tutorials explain.
5 min read
ReadKindle Create Alternative: Why Markfolio Is the Better Choice
Kindle Create forces you to install software, format manually, and only works for ebooks. Markfolio converts your manuscript into print-ready PDF and EPUB right from your browser.
4 min read
ReadBook Performance: The Metrics That Actually Matter in KDP
BSR, category rank, keyword position, and reviews: what each KDP metric measures, how to read it without misleading yourself, and when it is time to act.
6 min read
ReadFrom Markdown to EPUB: A Guide for Technical Authors
Convert your Markdown manuscript into an EPUB 3.0 file that passes epubcheck and gets accepted by Amazon KDP, step by step in your browser without installing Pandoc or Calibre.
3 min read
Read