About this video
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If you are running Amazon advertising campaigns, you have probably heard that keeping your ACoS low is the goal. But what if that thinking is actually costing you money? In this video, I break down why ACoS alone is not a reliable profit signal, what metrics you should be tracking alongside it, and how to make smarter decisions with your Amazon ads.
ACoS has been the go-to metric for Amazon advertising since the early days. For years, it was the only way advertisers and brand owners could judge account performance. If ACoS was low, things were good. If it was high, something was wrong. But that way of thinking is outdated, and it can actually lead you to make decisions that hurt your profitability.
The core issue is that ACoS is a ratio, not a profit signal. You can reduce your ACoS and still lose money, or you can run a campaign at 35% ACoS that generates more actual profit than a campaign running at 20% with lower volume. That trade-off is something you need to understand before making any changes in your Amazon ads campaign.
ACoS also completely excludes the lifetime value of a customer. If you are selling consumables or products that lead to repeat purchases, looking only at ACoS will cause you to underinvest in customer acquisition. A customer acquired at 80% ACoS might only cost you 10 to 14% when you factor in their lifetime value through repeat purchases or Subscribe and Save. That is a completely different picture.
During a product launch, ACoS is especially irrelevant. The goal during that phase is volume and organic rank improvement, not hitting a specific ACoS target. Driving ad volume helps improve organic rankings, which over time brings in more sales without ad spend.
So what should you track instead? Profit margin is the metric I always recommend looking at alongside ACoS. Track it week over week and month over month. That gives you a clear picture of whether your Amazon advertising is actually working. Total ACoS is also a better starting point than campaign-level ACoS alone. And if you are selling consumables, lifetime value is a metric you need to calculate and account for. Profit per unit is another useful number you can track inside tools to get a more complete view of your Amazon advertising performance.
Different ad types also have different purposes. Sponsored Display, for example, is not meant to deliver immediate returns, so panicking over a 150% ACoS on a Sponsored Display campaign does not make sense. The same applies to Sponsored Brands. Each ad type serves a different role in your Amazon advertising strategy, and judging them all by the same ACoS benchmark will lead you in the wrong direction.
The point is not to ignore ACoS entirely. It is one useful metric among many. But when it becomes the only number driving your decisions in Amazon pay per click advertising, it creates blind spots that cost you growth and profit.
Contents: 0:00 Why low ACoS can still mean losing money 0:27 ACoS as a metric: the history and the problem 1:12 How ACoS can limit your sales volume and growth 2:37 Break even ACoS, organic rank, and long-term strategy 3:26 Lifetime value and why ACoS misses repeat customers 4:18 What metrics to track instead of ACoS alone 5:47 Why Sponsored Display and Sponsored Brands have different ACoS expectations
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Transcript
Frequently asked questions
How is it possible for ACoS to go down while profit also goes down?
ACoS is a ratio of ad spend to ad-attributed revenue, not a measure of absolute profit. If you reduce bids and budgets to bring ACoS from 35% to 20%, you may achieve a cleaner ratio but at the cost of sales volume. A campaign running at 35% ACoS with higher spend and higher sales can generate more total profit in euros or dollars than a campaign at 20% ACoS with lower volume. The trade-off between margin efficiency and total profit contribution is something every seller needs to evaluate for their specific account, rather than optimizing for the lowest ACoS regardless of the impact on sales.
Why does running Amazon ads at break-even ACoS sometimes make strategic sense?
At break-even ACoS you are not making money from ads but you are not losing money either, and the ad volume you are generating contributes to your organic ranking. Sales velocity driven by ads signals relevance to Amazon's algorithm, which over time improves your organic position and brings in sales without further ad spend. Running at break-even is therefore an investment in organic momentum rather than immediate return, and for many sellers the long-term payoff of stronger organic rankings justifies the short-term absence of ad profit.
What metrics should you track alongside ACoS for a more complete picture of Amazon advertising performance?
Profit margin (tracked week over week and month over month) is the primary metric to pair with ACoS because it tells you whether the business is actually becoming more profitable. Total ACoS gives a broader view of how ad spend relates to all revenue including organic. For consumable products, customer lifetime value is essential because it reframes a high ACoS acquisition cost as a much smaller percentage of lifetime revenue. Profit per unit, available through tools like Sellerboard, provides product-level profitability context. Different ad types also need different benchmarks: Sponsored Display and Sponsored Brands serve awareness and consideration roles and should not be held to the same ACoS standard as bottom-funnel Sponsored Products campaigns.
