PPC ACoS calculator

ACoS, TACoS, and the math that decides whether your ads make money

Advertising cost of sale is the single number that tells you whether your Amazon ads are an investment or a leak. Here is how to read it properly.

ACoS, advertising cost of sale, is simply the percentage of your advertising-driven revenue that was eaten by the ad spend itself. Spend $25 on ads to generate $100 of sales and your ACoS is 25%. It is the most quoted metric in Amazon advertising, and also the most misunderstood, because a "good" ACoS is entirely relative to your margin. A 25% ACoS is healthy on a product with a 40% margin and ruinous on one with a 20% margin. The calculator above does the arithmetic; the judgment is in knowing what number you are actually aiming for.

Break-even ACoS vs. target ACoS

There are two ACoS numbers that matter, and confusing them is a common mistake. Your break-even ACoS is the point where an advertised sale makes zero profit, and it is determined purely by your margin. Your target ACoS is the number you actually aim for, and it sits below break-even by however much profit you want to keep from advertised sales. If your margin gives you a 35% break-even ACoS and you want to keep a third of that as profit, you might target around 23%. The calculator helps you see both, so your bids are tied to a deliberate goal rather than a guess.

Crucially, the right target changes with the product’s stage. At launch, you may deliberately run at or even above break-even ACoS to buy ranking and reviews, accepting short-term loss for long-term position. For a mature product, you tighten the target to protect profit. A fixed ACoS target applied to every product and every stage is a blunt instrument; the number should move with strategy.

Why TACoS tells the deeper story

ACoS only looks at advertised sales. TACoS, total advertising cost of sale, measures your ad spend against your total revenue, including organic sales. This is the number that reveals whether your advertising is building a self-sustaining business or just renting sales. When a product is healthy, advertising drives ranking, ranking drives organic sales, and TACoS falls over time even as total sales rise, the sign that the listing is increasingly carrying itself. A TACoS that stays high or climbs means the product depends on paid spend to sell at all, a warning worth heeding.

Watching ACoS for campaign efficiency and TACoS for overall business health together gives you a far truer picture than either alone. A campaign can have a beautiful ACoS while the product quietly fails to build organic momentum; only TACoS exposes that.

From number to managed strategy

Knowing your ACoS targets is the foundation, but hitting them consistently is daily work: mining search terms, adjusting bids, adding negative keywords, and shifting the target as each product matures. Because the true margin that sets your break-even ACoS depends on all your cross-border costs, freight, duty, prep, and Amazon’s fees, an accurate target only exists when those numbers are known. This is where our advertising management and the rest of the operation connect: we anchor every bid to your real economics, so your ACoS target is never a guess and your ad spend always serves profit, not just revenue.