Loading...
Calculate your advertising cost of sale, break-even ACOS, and campaign profitability. Optimize your Amazon KDP ad spend with data-driven insights.
Calculate your advertising profitability and optimize your campaigns
Lower your ACOS
Higher CTR and conversion rate — both start with the cover.
ACOS (Advertising Cost of Sale) measures how much you spend on advertising for every dollar of revenue generated. It is the most important metric for Amazon Ads.
ACOS = (Ad Spend / Ad Revenue) × 100
Break-even ACOS is the tipping point between profit and loss. It equals the percentage of revenue you keep after Amazon takes its cut.
Break-Even ACOS = (Royalty Per Unit / List Price) × 100
Example: $5.00 royalty on a $14.99 book = 33.4% break-even ACOS
Remove underperforming keywords and add negative keywords to stop wasted spend.
Reduce bids on high-ACOS keywords. Use our What-If tool to simulate impact.
Your book cover is your ad creative. A professional cover directly increases CTR.
Better descriptions, A+ content, and more reviews all improve conversion rate.
Start with automatic campaigns for discovery, then manual exact-match for winners.
Amazon Ads data can lag 7-14 days. Run campaigns for at least 2 weeks first.
ACOS (Advertising Cost of Sale) is the percentage of ad spend relative to the revenue generated from those ads. It is calculated as: ACOS = (Ad Spend / Ad Revenue) x 100. For example, if you spend $10 on ads and generate $50 in sales, your ACOS is 20%.
A good ACOS for KDP books typically ranges from 30% to 50%, depending on your royalty rate and printing costs. The key metric is your break-even ACOS: as long as your ACOS is below your break-even point, your ads are profitable.
Break-even ACOS is the maximum ACOS you can sustain before losing money on ad-generated sales. It equals your royalty as a percentage of your list price. If your break-even ACOS is 40%, any ACOS above 40% means you are spending more on ads than you earn from those sales.
To lower your ACOS: (1) Refine your keywords by removing underperformers and adding negative keywords. (2) Lower bids on high-ACOS keywords. (3) Improve your book listing (cover, description, reviews) to boost conversion rate. (4) Use exact match keywords for proven winners.
ACOS and ROAS are inversely related. ACOS = Ad Spend / Revenue (as a percentage), while ROAS = Revenue / Ad Spend (as a multiplier). An ACOS of 25% equals a ROAS of 4x. Lower ACOS and higher ROAS both indicate better ad performance.
Yes. Amazon Ads often create a "halo effect" where increased ad visibility boosts your organic ranking and sales. Your total ACOS (TACoS) may be significantly lower than your campaign ACOS because ads drive organic sales too.
Start with $5-10 per day for a new campaign and run it for at least 2 weeks to gather meaningful data. Once you identify profitable keywords, gradually increase spend on winners.
A good CTR for Amazon Sponsored Products ads on books is typically 0.3% to 0.5%. Above 0.5% is excellent. Low CTR usually means your book cover or ad targeting needs improvement.
Conversion rate (orders divided by clicks) directly impacts profitability. A higher conversion rate means each click is more likely to turn into a sale, lowering your effective cost per acquisition. For KDP books, a 10-15% conversion rate on ads is considered good.
Target ACOS is the ACOS you aim for to maintain a desired profit margin. Our calculator sets it at 70% of your break-even ACOS, providing a 30% profit margin on ad sales. Use it as a guide when setting bids and evaluating keyword performance.
Your cover is your Amazon ad creative. Create a professional one in 2 minutes.