ACOS is one advertising metric, not the entire business picture. It is calculated as advertising spend divided by attributed advertising sales. Review it alongside conversion, pricing, stock and product margin before deciding what to optimise.
Start with a realistic ACOS target
There is no single “good” ACOS for every product. A new product may need a higher ACOS while it is gathering visibility, while an established product may need tighter profitability control. Work backwards from your selling price, marketplace costs, product cost and desired contribution. This gives each product a target range instead of chasing the lowest possible number.
Check the advertised product listing first
Sponsored Products can bring qualified shoppers to a product page, but the listing still has to earn the order. Before increasing bids, review title clarity, primary image, supporting images, variation selection, price, delivery promise and stock. A weak detail page can make a well-targeted campaign look inefficient.
Amazon’s own advertising guidance recommends reviewing product detail pages and availability before launching or expanding campaigns. Keep the advertised ASIN in stock and make sure the offer is the one a customer expects after clicking.
Use a campaign structure you can actually read
Separate campaigns by product group, objective or targeting type so that the results are understandable. A practical starting structure might keep discovery targeting separate from the search terms or product targets that already perform well. The point is not to create dozens of campaigns—it is to make budget decisions with confidence.
- Use discovery campaigns to learn which searches and product targets attract shoppers.
- Move proven, relevant terms into focused campaigns where you can control bids and budgets.
- Use negative targets where they are appropriate to reduce wasted spend.
- Keep branded and non-branded goals separate if you need different reporting.
Review search terms and product targets
Look for a pattern, not one isolated click. Search terms with meaningful spend and no sales may need a lower bid, a negative target or a better-matched product. Terms that convert efficiently may deserve their own controlled campaign. Also look at the shopper’s intent: a highly relevant term can still fail if your price, pack size or product promise does not match the search.
Optimise gradually and keep notes
Adjust bids, budgets and targets with a clear reason, then allow enough time to evaluate the result. Avoid changing bids, images, price and targeting on the same day because you will not know which change caused the outcome. A simple optimisation log—with date, change, reason and result—makes weekly decisions much easier.
A practical weekly PPC routine
Once a week, review spend, attributed sales, ACOS, conversion and search-term quality for your priority products. Check whether the product was in stock and whether its price or offer changed. Once a month, review the campaign structure: pause clutter, separate proven terms and shift budget toward products that can fulfil and convert reliably.
Common ACOS mistakes
Do not judge a campaign using ACOS alone, cut every high-ACOS keyword immediately or raise budgets without checking product readiness. A low ACOS on a very small amount of sales may not be more valuable than a sensible ACOS that is helping a profitable product grow. The right decision depends on the business goal for that product.
Official further reading
Amazon Ads explains Sponsored Products best practices and its targeting options in more detail. Check the current guidance before making account-level changes.
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