https://usabookstudios.com/guides/ Free tools for independent authors. Measure, format, price and publish with confidence. en-us Tue, 29 Sep 2026 12:00:00 GMT https://usabookstudios.com/guides/kindle-unlimited-pay-per-page/ https://usabookstudios.com/guides/kindle-unlimited-pay-per-page/ Tue, 29 Sep 2026 12:00:00 GMT Kindle Unlimited paid about $0.00489 per page read (KENP) on Amazon.com for August 2026, as reported by authors. Amazon does not publish the rate. KDP set the Global Fund at $66 million that month. At that rate, 1,000 pages read earn about $4.89 and 100,000 pages about $489.48. https://usabookstudios.com/guides/how-to-format-kdp-book-description/ https://usabookstudios.com/guides/how-to-format-kdp-book-description/ Tue, 29 Sep 2026 12:00:00 GMT KDP book descriptions accept 12 HTML tags: b, i, em, u, br, p, h4, h5, h6, ol, ul and li. Every tag except br needs a closing tag. The limit is 4,000 characters, and KDP counts the tags too. Headings h1 to h3, links, images and emoji are not supported, and KDP does not allow contact details or reviews. https://usabookstudios.com/guides/good-acos-for-books/ https://usabookstudios.com/guides/good-acos-for-books/ Tue, 29 Sep 2026 12:00:00 GMT A good ACOS is one below your break-even ACOS: your royalty divided by the list price. A $14.99, 300-page 6 x 9 in paperback breaks even at 29.3%; a $4.99 Kindle ebook at 70% breaks even at 65.7%. There is no single good number for every book. https://usabookstudios.com/guides/kindle-ebook-cover-size/ https://usabookstudios.com/guides/kindle-ebook-cover-size/ Tue, 29 Sep 2026 12:00:00 GMT KDP's ideal Kindle ebook cover is 1,600 x 2,560 px (width x height), a height to width ratio of 1.6:1. The minimum is 625 x 1,000 px, and no side may exceed 10,000 px. Upload a JPEG or TIFF in RGB color, under 50 MB, with minimal compression. https://usabookstudios.com/guides/do-you-need-an-isbn-for-kdp/ https://usabookstudios.com/guides/do-you-need-an-isbn-for-kdp/ Mon, 28 Sep 2026 12:00:00 GMT You need an ISBN for a KDP paperback or hardcover, but not for a Kindle ebook or a low-content book. KDP offers a free ISBN that shows "Independently published" as the imprint and can only be used on KDP. To sell the same edition elsewhere, buy your own. Each format needs its own ISBN. https://usabookstudios.com/guides/word-count-to-pages/ https://usabookstudios.com/guides/word-count-to-pages/ Mon, 28 Sep 2026 12:00:00 GMT In a 6 x 9 in paperback set in 11 pt Garamond, 50,000, 80,000 and 100,000 words fill about 178, 276 and 348 pages. At 5.5 x 8.5 in they fill about 206, 330 and 406. Double-spaced in Word, the manuscripts run about 198, 317 and 396 pages. https://usabookstudios.com/guides/kdp-print-cost/ https://usabookstudios.com/guides/kdp-print-cost/ Mon, 28 Sep 2026 12:00:00 GMT KDP charges a fixed fee plus a rate per page. On Amazon.com a black ink paperback on a regular trim costs $1.00 plus $0.012 per page, or a flat $2.30 at 110 pages or fewer. A 300-page 6 x 9 in novel costs $4.60 to print. Large trims and color cost more. https://usabookstudios.com/guides/kdp-spine-width-formula/ https://usabookstudios.com/guides/kdp-spine-width-formula/ Mon, 28 Sep 2026 12:00:00 GMT KDP spine width equals page count times the paper's thickness per page. Use 0.002252 in per page for white paper, 0.0025 in for cream, 0.00235 in for groundwood, 0.002252 in for standard color and 0.002347 in for premium color. A 300-page book on white paper has a 0.676 in spine. https://usabookstudios.com/guides/kdp-70-percent-royalty-range/ https://usabookstudios.com/guides/kdp-70-percent-royalty-range/ Mon, 28 Sep 2026 12:00:00 GMT Since July 7, 2026, Kindle ebooks on Amazon.com qualify for KDP's 70% royalty at list prices from $2.99 to $12.99, up from a $9.99 ceiling. You earn 70% of the list price minus VAT and a delivery cost of $0.15 per MB. Outside the band, only the 35% plan is available. https://usabookstudios.com/guides/what-goes-on-a-copyright-page/ https://usabookstudios.com/guides/what-goes-on-a-copyright-page/ Mon, 28 Sep 2026 12:00:00 GMT A copyright page carries the copyright notice: the © symbol or the word Copyright, the year of first publication and the owner's name. Most books add a rights statement, a disclaimer, an ISBN for each format, the edition and credits. In the US the notice has been optional since March 1, 1989, but it still helps.