Understanding ACOS
ACOS (Advertising Cost of Sales) is the single most important metric for measuring your Amazon PPC profitability. It tells you how much you spend on ads for every dollar of ad revenue — and whether your campaigns are making or losing money.
How ACOS is calculated
Formula: Ad Spend ÷ Ad Revenue × 100
Example: You spend $30 on ads and generate $100 in ad sales.
$30 ÷ $100 × 100 = 30%
In plain terms: for every $1 of ad sales, you spent $0.30 on ads. Lower ACOS means your ads are more efficient.
Amazon calculates ACOS at every level — account, campaign, ad group, and keyword — so you can pinpoint exactly where your budget is working hardest.
What ACOS should you target?
There is no universal "good" ACOS. Your target depends on your profit margins, product category, and business strategy.
| Strategy | Typical ACOS range | Why it works |
|---|---|---|
| Brand awareness or launch | 50–100%+ | You invest in visibility and organic ranking. Short-term losses fund long-term growth. |
| Subscriptions or high LTV | 60–80% | The first sale may lose money, but repeat purchases make the customer profitable. |
| Profit maximizing | Below break-even | Every sale is immediately profitable after ad costs. |
Most new products see 30–40% ACOS after the first few weeks. During launch, 80–100%+ is normal and expected — you are paying to build reviews, ranking, and organic momentum.
How to calculate your break-even ACOS
Your break-even ACOS is the point where you neither make nor lose money on each sale. It equals your profit margin percentage (before ad costs).
Formula: (Sale price − product cost − Amazon fees) ÷ Sale price × 100
Example: You sell a product for $25. Your product cost is $8, and Amazon fees (referral + FBA) total $5.
($25 − $8 − $5) ÷ $25 × 100 = 48%
Any ACOS below 48% is profitable for this product. An ACOS above 48% means you are losing money on that sale from ads.
Amazon fees vary by category and product size. Check your Manage Your Transactions report in Seller Central for your actual per-unit fees.
Key factors that affect your ACOS
Understanding what drives ACOS helps you improve it:
- Listing quality — Strong images, bullet points, and A+ content convert more clicks into sales, directly lowering your ACOS. This is the highest-leverage change you can make.
- Keyword accuracy — Targeting relevant, high-intent keywords reduces wasted clicks. Broad or irrelevant keywords drive up spend without matching sales.
- Click-through rate (CTR) — A higher CTR means your ad is relevant to shoppers. Low CTR signals that your ad copy, images, or pricing need attention.
- Cost per click (CPC) — Determined by bidding competition in your category. Higher CPC increases your ACOS unless conversion rates keep pace.
- Product age and reviews — New products with few reviews typically convert at lower rates, resulting in higher ACOS. This improves naturally over time.
If your ACOS is higher than expected, start with your listing. Optimizing your main image, title, and bullet points often has a bigger impact than adjusting bids.
How AdTrix uses Target ACOS
You set a Target ACOS for each campaign (or a default for your entire account). AdTrix automation then adjusts your keyword bids daily to move your actual ACOS toward your target.
- Below target: AdTrix may increase bids to capture more sales while staying profitable.
- Above target: AdTrix reduces bids to bring spending back in line with your goal.
You stay in control. AdTrix is a co-pilot — you set the destination (your Target ACOS), and the tool handles the driving (bid adjustments). You can change your target at any time from the guidance panel in Ad Manager or from the campaign settings.
What's next
- Understanding TACOS — see how your ads affect total business health, including organic sales
- Your first optimization — walk through a hands-on optimization workflow
- Managing campaigns — explore the full campaign table and all available actions