Publishing on Amazon KDP comes down to five decisions, and four of them are numbers. These five tools answer one each. Free, no sign-up, no usage limits.
To compare what a Kindle Unlimited read pays against an outright sale.
What order to use them in
The order above is not alphabetical: it is the real sequence of publishing a book. Used this way, each tool answers with figures the previous one gave you.
Title first, because it drives the cover and the keywords people will find you by. A good manuscript with a bad title does not sell.
Then the structure: how many chapters, where the midpoint twist lands, how long each act runs. This is what prevents the sagging second act, which is where most manuscripts get abandoned.
Then royalty per sale, which tells you what price makes sense. The jump from 35 to 70 percent depends on the price band, and it is the difference between a profitable book and one that is not.
With that figure, monthly profit: estimated sales, VAT for the marketplace, and what is actually left. This is where you find out whether the niche supports a business or just one book.
And finally KENP, if you are weighing KDP Select. It compares what a full Kindle Unlimited read pays against an outright sale, which is the only way to decide on exclusivity with numbers.
What these tools do not do
Worth saying before your dashboard surprises you:
Amazon sets the Kindle Unlimited per-page rate every month, splitting a global fund across all pages read. It is not a fixed value and nobody can predict it: the one the calculator ships with is a reference figure you should replace with the current month's.
KENP pages are not your book's pages. Amazon normalises the text with its own formatting. Estimating from word count is approximate; the exact number lives in your KDP dashboard.
None of them predicts sales. They calculate what you would earn if you sell what you tell them. The sales figure is yours to supply, and it is the one variable these tools cannot help you estimate.
None replaces your KDP dashboard, which is the only real source of your numbers.
Frequently asked questions
Are they really free?
Yes. No sign-up, no usage limits, and none of the five has a paid tier. They are calculators, not a trimmed-down demo of the product.
Are the numbers I enter stored anywhere?
No. Every calculation runs entirely in your browser: what you type is never sent to a server and never stored.
Do I need an Amazon KDP account to use them?
No, they work with figures you can estimate. But two values are only exact in your KDP dashboard: your book's real KENP page count and the current month's per-page rate. With those two, the result stops being an estimate.
Do they work for books in any language?
The money ones do: royalties, profit and KENP depend on price and marketplace, not on the language of the book. The title generator and the outline planner work in whichever language you use them.
And when it is time to write it
These five tools handle the maths around the book. The book itself still has to be written, and that is where YourNovel.app comes in: it writes complete manuscripts with a memory that holds the whole work, ready to export for KDP with 100 percent of the rights. Starting is free, no card required.
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