Amazon Ads Guide for Authors
Learn how to target buyers, set bids that match your royalty math, and read your reports so every dollar you spend works harder over time.
Get Free Reviews →Understand Campaign Types Before You Spend
Amazon Ads for books runs through KDP and offers three main campaign types: Sponsored Products, Sponsored Brands, and Lockscreen Ads. Sponsored Products are the workhorse — they place your book in search results and on competitor product pages and are where most authors should start. Sponsored Brands require you to have a published author page and let you run a banner ad showing multiple books. Lockscreen Ads (formerly Product Display Ads) appear on Kindle e-readers and work well for ebooks in KDP Select. Start with Sponsored Products, get your targeting dialed in, and only expand to other campaign types once you have a profitable baseline. Spreading budget across all three types from day one dilutes your learning.
Build Your Keyword Strategy From the Ground Up
Your keyword list should cover three layers: genre and subgenre terms, trope and theme terms, and comparable author names. Genre terms (“paranormal romance”, “military sci-fi”) have high search volume but also high competition and cost. Trope terms (“slow burn romance”, “found family fantasy”) are more specific and often convert better because readers searching them know exactly what they want. Comparable author names are effective but expensive — bid conservatively here and only on authors whose readers you're confident will like your book. Use broad match for discovery, phrase match for intent, and exact match for your proven converters. Review your search term report every two weeks and harvest new terms that are actually earning clicks and sales.
Set Bids That Match Your Royalty Math
Your bid per click directly determines your profitability ceiling. If your book earns a $3 royalty and your average conversion rate is 10% (one purchase per ten clicks), each sale costs you ten times your bid in ad spend. At a $0.25 bid, that's $2.50 in ad spend per sale — profitable. At a $0.60 bid, that's $6.00 per sale — a loss. Map out your break-even bid before you set any campaign live. Start bids 20% below Amazon's suggested bid to collect data cheaply, then raise bids on keywords that convert and lower or pause keywords that spend without converting. Adjust bids weekly during your first month, then monthly once you have a stable campaign.
Use Product Targeting to Steal Also-Bought Placement
Product targeting lets you place your book on specific competitor ASINs or on your own books for cross-selling. The highest-value placement in product targeting is the “also bought” carousel on books similar to yours. Find the top five to ten books in your category with the most reviews — these get the most page views — and target them directly. Your book appears on their product pages in front of readers who are already warm to your genre. Also target your own backlist titles to catch readers who find one of your books and give them an easy path to your others. Keep product targeting bids separate from keyword campaigns so you can optimize each independently.
Read Your Reports Weekly
The search term report inside your campaign manager is the single most valuable data source you have. Download it weekly and sort by spend, highest to lowest. Any search term that has spent more than twice your royalty without a purchase is a candidate for a negative keyword. Any term with a purchase and a reasonable ACOS is a candidate for exact match targeting with a higher bid. Look for patterns: if five different variations of “cozy mystery cats” all convert, add a phrase match version of that core term to your manual campaign. The authors who build profitable ad accounts are the ones who treat this report as their primary feedback loop, not an optional monthly chore.
Build Your Review Count Before Scaling Budget
An Amazon Ads account with a well-built campaign but a book with two reviews is like a great billboard for a restaurant with no Yelp rating. Buyers who click your ad land on your product page and evaluate the reviews before purchasing. A book with fewer than ten reviews converts significantly worse than the same book with 25 or more, at the same bid and placement. Use iWrity to build your review count with genre-matched ARC readers before you push your ad budget past $10 per day. Every review you add improves your organic conversion rate on every impression your ad generates, which effectively lowers your cost per sale across your entire campaign without changing a single bid.
Get Reviews Before Your Ads Go Live
Your Amazon Ads convert better when your listing already has reader reviews. iWrity gets them there before you spend on traffic.
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Frequently Asked Questions
What budget should I start with for Amazon Ads?
Start with $5 to $10 per day per campaign and treat the first four weeks as a data-gathering period, not a profitability period. You need enough impressions to learn which keywords and product targets actually convert for your specific book. Too low a budget and you won’t get statistically meaningful data; too high and you’ll burn through money before you know which placements are working. After four weeks, review your search term report, identify which keywords drove purchases, raise bids on those, and cut or lower bids on everything that spent without converting.
Should I use automatic or manual targeting for author Amazon Ads?
Use automatic targeting first to discover which keywords and ASINs Amazon associates with your book, then use manual targeting to build on what you find. Run an auto campaign at a moderate bid for four weeks and download your search term report. Look for keywords with clicks and purchases and move those terms into a manual keyword campaign with exact match targeting. Keep your auto campaign running at a lower bid as a discovery engine. This two-campaign approach is more work to set up but dramatically more efficient than relying on auto targeting alone long-term.
How do I know if my Amazon Ads are profitable?
The metric to watch is ACOS — Advertising Cost of Sale. ACOS is your ad spend divided by attributed revenue. Calculate your break-even ACOS by dividing your royalty by your list price. For example, if you earn $3.50 on a $9.99 book, your break-even ACOS is 35%. Keep in mind that Amazon Ads attribution only captures direct purchases; Kindle Unlimited reads and subsequent series purchases from new readers aren’t counted. Your real profitability is likely better than your ACOS alone suggests, especially if you write in a series.
How do I find the right keywords for my book’s ads?
Start with genre terms, trope terms, and comparable author names. Amazon’s suggested keywords in the manual campaign setup are a useful starting list but not exhaustive. Use Publisher Rocket or a similar tool to find keywords buyers actually search. Look at the also-bought section on your product page and target those ASINs directly with product targeting. Your auto campaign’s search term report is your best ongoing keyword source — it shows you real buyer search terms, not just plausible ones.
Why are my Amazon Ads getting impressions but no clicks?
Impressions without clicks almost always mean your cover or price isn’t converting at the impression stage. A reader sees your ad thumbnail in a row of covers and scrolls past; the keyword targeting may be perfect but the cover isn’t compelling enough to earn a click at that placement. Test a different cover or review your title text. Price also matters: if comparable books in your category are priced at $3.99 and yours shows at $9.99 in an ad, you’ll collect impressions but lose clicks to the cheaper alternative. Check that your review count is visible — books with zero reviews often lose clicks to books with social proof.
Lower Your Cost Per Sale by Building Reviews First
A listing with genuine reader reviews converts clicks into sales at a higher rate, which means every ad dollar stretches further.
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