Free Amazon Ads break-even calculator
KDP advertising guide
The most common KDP ad mistake is not a bad keyword. It's running ads on a book that was never checked.
Amazon ads multiply surface area, not quality. The authors who constantly make automatics 'easier' and lose money are almost always advertising a listing with broken metadata or an unfinished interior.
Checked:
✓Auto campaigns: learn, don't scale✓Break-even = price minus costs, minus royalty✓Fix the listing before you raise bids
The six mistakes that keep showing up
Community threads on self-publishing repeat the same errors: scaling auto campaigns without negative keywords, splitting every keyword into its own campaign, ignoring ACOS until the invoice arrives, bidding on royalty-implausible keywords, switching books mid-campaign, and — most common — advertising before the listing's metadata and interior are polished.
- 1. Scaling auto without negatives
- 2. Campaign per keyword (fragmentation)
- 3. Never checking ACOS against break-even
- 4. Bidding on terms that can't pay the royalty
- 5. Copying the campaign to a new book
- 6. Advertising an unverified listing
The math that decides everything
Your break-even click cost is whatever maximizes at the margin: price, print cost, delivery fee, then royalty. Any bid above break-even is a donation to Amazon unless it's a deliberate budget experiment.
Run the numbers on every campaign before you create it. The KDP royalty calculator and the ad break-even calculator remove the guessing — the two numbers most authors never compute before they spend.
| Metric | Healthy | Warning | Stop |
|---|---|---|---|
| ACOS | Below break-even | Slightly above | Way above |
| Impressions to clicks | 3–8% | <2% | <1% for weeks |
| Clicks to orders | >8% | 4–8% | <3% |
FAQ
Frequently asked questions
Should I start with automatic campaigns?
Yes — as a discovery tool. The 'easier' claim is only true if you then mine the search terms, add negatives, and move winners. Auto forever without negatives is the classic budget drain.
How much should I spend on KDP ads as a new author?
When your royalty per sale cannot cover the click cost, no budget makes it work. Compute break-even first, then choose a number you can afford to lose over a month of testing.
What's the cheapest way to check my listing is ready?
Free checks: metadata checklist, interior EPUB validation, cover geometry. They cost nothing and catch the issues that make any ad campaign unprofitable.
What does ACOS mean?
Ad spend divided by attributed sales. It is only meaningful against your break-even number, which is why the calculator should live one bookmark from your campaigns.
Compute break-even before your next bid.
Enter your price, costs, and royalty — the ad break-even calculator tells you the exact click cost you can afford.