Amazon Ads for Authors Guide
Amazon Advertising is the most direct path to putting your book in front of readers who are actively searching for your genre on the platform where most ebook sales happen. Understanding campaign types, keyword targeting, bid strategy, and how to read your ACOS is what separates profitable book advertising from budget burning.
Start Your ARC Campaign →Amazon Ads for Authors: Key Concepts
Campaign Types
Sponsored Products (the primary tool for most authors), Sponsored Brands (brand registry required), and Lockscreen Ads — start with Sponsored Products auto-targeting
Keyword Strategy
Auto campaign first to harvest proven converters; then manual campaigns with phrase and exact keywords plus ASIN targeting of comparable books
Bid Strategy
Start at suggested bids, adjust based on ACOS performance; increase bids on efficient keywords, pause or reduce bids on non-converters
ACOS Targets
50-60% of royalty rate for standalone; series book one can sustain higher ACOS if read-through to later books is modeled; KU income lowers your real ACOS
Page Optimization First
Cover, blurb, reviews, and categories must be strong before running significant ad spend — ads amplify your existing conversion rate
Common Mistakes
Ads before reviews, too-broad keywords from the start, ignoring search term reports, set-and-forget campaigns, expecting immediate profitability
Build Reviews Before Running Ads
Amazon Ads work best when your product page converts — and reviews are the most powerful conversion factor. iWrity's ARC campaign builds your review base before you spend on advertising, so every click you pay for has the best chance of becoming a sale.
Start Your ARC Campaign →Frequently Asked Questions
What types of Amazon Ads are available for book authors?
Amazon Advertising for books offers three primary campaign types. Sponsored Products: the most widely used type for books — ads appear in search results and on product pages; you bid on keywords or target specific products (ASINs); the ad shows your book cover, title, and price; clicks lead directly to your book's product page. Sponsored Brands: requires a brand registry account (not available to all KDP authors); shows a custom headline with 1-3 books in a banner ad above search results; useful for driving awareness of an author brand rather than a single title. Lockscreen Ads (Kindle Ads): ads shown on Kindle device lockscreens and in the Kindle app; targeted by genre and reader interest rather than by keyword; useful for awareness campaigns to Kindle readers. For most indie authors, Sponsored Products are the primary tool — Sponsored Brands and Lockscreen Ads require more spend to be efficient and are less commonly used until an author is running multiple titles. Within Sponsored Products, you can run automatic targeting (Amazon selects the keywords based on your book's metadata) or manual targeting (you select your own keywords and bids).
How do you choose keywords for Amazon book ads?
Amazon book ad keyword strategy: Keyword types: broad keywords (romance, fantasy, thriller — high volume, high competition, expensive; usually not efficient for most authors); phrase keywords ('paranormal romance books', 'epic fantasy series' — more targeted, often more efficient); exact keywords ('fallen angel romance books' — highly targeted, lower volume, often lower competition); and ASIN targeting (targeting readers who are viewing specific books — competitor titles or complementary titles in your genre — very effective for romance and genre fiction where readers browse by series). Keyword research methods: use the auto campaign first (run an automatic targeting campaign for two to four weeks; harvest the keywords that produced sales from the auto campaign's search term report; these are proven converters for your specific book); search Amazon for your genre terms and note the autocomplete suggestions (these are high-volume actual reader searches); look at the 'customers also bought' section on comparable books (these titles are natural ASIN targets). Negative keywords: add negative keywords for search terms that are generating clicks but no sales — this prevents budget waste on irrelevant traffic.
What should your bid strategy be for book ads?
Amazon book ad bid strategy: starting bids for most genres: begin with the suggested bid Amazon shows for each keyword (Amazon's suggestion is based on competitive data and is a reasonable starting point); adjust based on actual ACOS performance over the first two to four weeks. Bid adjustment principles: keywords with low ACOS (generating sales efficiently) can have their bids increased to capture more impression volume; keywords with high ACOS (spending more than they generate) should have bids reduced or the keywords paused; keywords generating impressions and clicks but zero sales for 20+ clicks should be paused or have bids significantly reduced (they are attracting the wrong audience). KDP Select vs. wide: bid strategy differs — in KDP Select, a page read has a value (Kindle Unlimited page read income) that a sale does not account for alone; your effective ACOS calculation should include KU page read income, not just direct sales; in wide distribution, every sale counts as direct royalty income. Dynamic bidding: Amazon offers 'down only' (Amazon may reduce your bid if the click is less likely to convert), 'up and down' (Amazon adjusts bids upward or downward; can increase spend significantly and is generally not recommended for most authors), and 'fixed bids' (always bids at the exact amount you set; useful when you want precise control).
What ACOS target should book authors aim for?
ACOS (Advertising Cost of Sales) is the percentage of revenue spent on ads — a 50% ACOS means you spent $1 on ads for every $2 in book revenue. The 'good' ACOS for authors depends on: your royalty rate (a book priced at $4.99 generating 70% royalties earns $3.49 per sale; if your cost per sale is $1.50, your ACOS is 30% of $4.99 revenue = 30% ACOS; but your ad spend is $1.50 against $3.49 royalty — a 43% ad-to-royalty ratio; this is profitable but not hugely so); series vs. standalone economics (for a series, your ACOS calculation should ideally include read-through to later books — an ACOS that loses money on book one may be highly profitable across a series; authors who model read-through can afford much higher ACOS on book one); and KU page read income (for KDP Select authors, the ACOS shown in Amazon Ads doesn't include KU income; your real ACOS may be significantly lower than shown). General targets: for a standalone with no series: ACOS of 50-60% of your royalty rate is typically profitable; for series book one: 100% or even higher ACOS can be profitable if read-through to books two and beyond is strong; for wide authors: calculate ACOS against your actual royalty income per sale rather than against list price.
What are the most common Amazon Ads mistakes indie authors make?
Common Amazon Ads mistakes: launching ads before having sufficient reviews (ads drive traffic to your product page; if your page has few reviews, that traffic converts poorly — most genre fiction benefits from having at least 10-15 reviews before running significant ad spend); running ads with an unoptimized product page (cover, title, blurb, and categories must be strong before ads amplify your page's traffic; ads make your existing conversion rate efficient or inefficient, not better); too-broad keyword targeting from the start (starting with very broad genre keywords like 'romance books' generates expensive clicks from readers seeking authors or subgenres very different from your book; start specific and broaden based on proven performance); ignoring the search term report (the search term report in automatic campaigns shows exactly what readers typed when they clicked your ad; this data is gold — harvest converting terms and add non-converting terms as negatives; most authors ignore it); setting and forgetting (Amazon Ads require regular monitoring — bids, keywords, and campaign structure need adjustment every week or two in active campaigns; campaigns left unchanged for months usually drift into unprofitability); and expecting immediate profitability (Amazon Ads typically take two to four weeks to collect enough data to optimize; new campaigns often look inefficient before patterns emerge).