Profit Score, 0–100
One clear verdict on margin, profit per sale, and royalty structure. Know if you're looking at a strong opportunity or a book that loses money on every sale.
Free KDP profit audit
Will your KDP book actually make money — before you publish?
Most calculators stop at the royalty number. KDP System shows your real profit after printing, delivery, and ad spend — then gives you a Profit Score and three fixes.
- Official KDP rate tables
- 5 marketplaces, 4 formats
- No signup to calculate
- Email only for the full report
For the author.
And the business behind the book.Know your numbers before you publish.
Free profit audit
Run your numbers
Official KDP rates
US · UK · CA · AU · DE
eBook · Paperback · Hardcover
Updated Oct 2026
For the business behind the book
Every great book deserves a smarter start.
Publishing is creative work. Understanding your numbers should be simple, so you can move forward with clarity.
See how it worksWhat you get
A profit audit, not another royalty calculator.
Free calculators tell you what Amazon pays. This tells you whether the book is worth publishing — and what to change before you do.
Break-even ad spend
The maximum you can pay per sale before ads eat your profit. Use it as a ceiling, not a target, when you set bids or scale a campaign.
Three personalized fixes
Price band, printing cost, delivery fee, marketplace — see the three changes that move your number the most, ranked by impact.
How it works
Two minutes from “maybe” to a real number.
No spreadsheets, no guessing at printing costs, no surprise delivery fees. Enter the book you're planning and see the economics.
- 1
Enter your book details
Format, marketplace, list price, page count or file size. Add ad spend and monthly sales if you want a projection.
- 2
Run the audit
Official KDP tables calculate your royalty, printing cost, delivery fee, net profit, margin, and break-even ad spend.
- 3
Unlock your full report
See your Profit Score breakdown, three fixes, and a PDF you can keep. Email is required for the full report — the basic numbers are free.
Sample audit
Paperback · US
200 pages · black & white · $12.99
73
/ 100
Royalty / sale
$4.39
Net profit
$3.39
Margin
26.1%
Break-even ad spend
$4.39
Your 3 fixes
- 1Keep ad spend below $4.39 per sale. Above that, ads buy sales at a loss.
- 2Your margin is 26.1%. Test a $13.99 price or a shorter book before scaling.
- 3Compare the same book in the UK and Germany — the margin can be higher per sale.
Full score breakdown and PDF unlock with your email.
Who it's for
If you're spending money on a KDP book, run the numbers first.
First-time publishers
Avoid the classic mistake: a book that looks popular but loses money on every sale after printing and ads.
Low-content creators
Journals, planners, and activity books live and die by page count and printing cost. See the margin before you design 120 pages.
Authors scaling ads
Know your break-even ad spend per marketplace so you can scale the campaigns that actually make money.
New to KDP?
Get the free Starter Kit — 3 templates, 5 covers, and a 7-day plan.
FAQ
Questions publishers ask before trusting the numbers.
Is the KDP profit audit really free?
Yes. You can run the numbers and see your basic royalty, printing cost, and net profit without signing up. The full Profit Score breakdown, three personalized fixes, and PDF report unlock with your email.
Which Amazon marketplaces are supported?
The audit supports Amazon.com (US), Amazon.co.uk (UK), Amazon.ca (Canada), Amazon.com.au (Australia), and Amazon.de (Germany/EU). Hardcover is supported in the US, UK, and Germany.
How accurate is the royalty and printing cost estimate?
The calculator uses official KDP printing cost and royalty tables, last verified in October 2026. It is an estimate, not a guarantee: KDP rates, VAT, price bands, and eligibility can change. Always verify your numbers in KDP before publishing.
Does the audit include VAT?
EU list prices include VAT, which KDP deducts before calculating royalties. The audit gives a close estimate, but your final royalty can be lower after VAT and marketplace-specific rules. UK eBook VAT is currently 0%.
Is KDP System affiliated with Amazon?
No. KDP System is an independent tool. KDP and Kindle Direct Publishing are trademarks of Amazon.com, Inc. We are not endorsed by, affiliated with, or sponsored by Amazon.
What happens to my email address?
We use it to send your report, a short KDP profit email course, and occasional KDP tips. No spam. You can unsubscribe in one click, and we never sell your email address.
Can I use this for low-content books?
Yes. Choose paperback or hardcover, enter the page count and interior type, and the audit applies the same KDP printing cost tables used for journals, planners, and activity books.
Your next book
Know your profit before you publish.
Run the free audit in under two minutes. No signup to calculate. Email only when you want the full report and PDF.