Only if your profit margin before ads is above 30%. ACoS is good when it's below your break-even ACoS, which equals your margin. A 30% ACoS is great on a 45%-margin product and a money-loser on a 20%-margin one — so judge it against your own margin, not a benchmark.

What is break-even ACoS?

Break-even ACoS is the ACoS at which ad spend exactly equals the profit on the sales it generates. It equals your profit margin before advertising — the share of the price left after product cost and Amazon fees. Below it, ad-driven sales are profitable; above it, they lose money.

What's the difference between ACoS and TACOS?

ACoS divides ad spend by ad-attributed sales only. TACOS divides ad spend by total sales (organic plus paid). ACoS is best for managing individual campaigns; TACOS is the better gauge of whether advertising is genuinely growing the business and building organic rank over time.

How do I calculate ACoS?

ACoS = ad spend ÷ ad-attributed sales, expressed as a percentage. If you spent $20 on ads that produced $100 in sales, your ACoS is 20%. Amazon reports it in your campaign dashboard, but compare it to your break-even ACoS (your margin) to know whether it's actually good.

Should ACoS be high or low?

Lower ACoS means more profit per ad-driven sale, so for an established product you generally want it below break-even. But a deliberately higher ACoS can make sense during a launch or ranking push, where you trade short-term ad loss for organic rank and future sales.

Learn · Profit & margin

What is a good ACoS on Amazon?

Short answer

A good ACoS is one that's below your break-even ACoS, and your break-even ACoS equals your profit margin before advertising. So if your product has a 30% margin, any ACoS under 30% is profitable on those ad-driven sales. There is no universal "good" number — it depends entirely on your margin and your goal for the campaign.

By Marcus Brandt · Head of Seller Accounting

Updated June 26, 2026

ACoS (Advertising Cost of Sale) is the percentage of ad-driven revenue you spend on advertising: ad spend divided by ad sales. Sellers constantly ask "what's a good ACoS," but the honest answer isn't a number — it's a relationship to your margin.

The key concept, and the one that's stable enough to actually rely on, is break-even ACoS. Once you understand that, you can judge any ACoS figure for your own product instead of chasing a benchmark that may not apply to you.

Break-even ACoS = your margin

Your break-even ACoS is the point where advertising spend exactly equals the profit on the sales it generates. It's equal to your profit margin before ad spend — the share of the sale price left after product cost and all Amazon fees, but before advertising.

If a product sells for $30, costs $9 to make and land, and loses $12 to Amazon fees, you keep $9 before ads — a 30% margin. Your break-even ACoS is therefore 30%. Spend less than 30% of ad revenue on ads and those sales are profitable; spend more and you're paying to lose money on each one.

This is why "a good ACoS" is relative. A 25% ACoS is excellent for a high-margin product but ruinous for a thin-margin one. Calculate your margin first; that's your line.

Good ACoS depends on your goal

Profitability isn't the only reason to advertise, so the "right" ACoS shifts with strategy:

•Profit-focused — keep ACoS comfortably below break-even so every ad-driven sale nets a profit. This is the default for established products.
•Launch or ranking push — sellers often accept an ACoS at or above break-even temporarily to drive sales velocity, win the Buy Box, and climb organic rank. The ads lose money on purpose, paid back by future organic sales.
•Defensive — bidding on your own brand terms can run a high ACoS but protects you from competitors poaching your traffic, which is hard to value in ACoS alone.
•Clearance — running aggressive ads to liquidate aging inventory may justify an ACoS above break-even if it beats long-term storage fees and capital lockup.

Why ACoS alone can mislead — look at TACOS

ACoS only measures sales that ads directly attributed. It ignores the organic sales your ads help drive, which makes a campaign look worse than it is during a successful launch.

Total Advertising Cost of Sale (TACOS) — ad spend divided by total revenue (organic plus paid) — is the better long-term health metric. A falling TACOS while sales grow means your advertising is building organic momentum rather than just renting it. Watch both: ACoS to manage individual campaigns, TACOS to judge whether advertising is genuinely paying off across the business.

Getting your margin right first

Because break-even ACoS is just your margin, a wrong margin means a wrong ACoS target. Sellers routinely under-count fees — forgetting storage, returns, or the fixed FBA fulfillment fee — and set an ACoS ceiling that's secretly above break-even.

Calculate your true per-unit margin using current Amazon fees and your real landed cost, then set your ACoS target against that number. For tactics on structuring campaigns once your targets are set, see our Amazon PPC guide. BeanHawk's settlement reconciliation also surfaces the fees that quietly erode the margin your ACoS target depends on.

Frequently asked questions

Is a 30% ACoS good?: Only if your profit margin before ads is above 30%. ACoS is good when it's below your break-even ACoS, which equals your margin. A 30% ACoS is great on a 45%-margin product and a money-loser on a 20%-margin one — so judge it against your own margin, not a benchmark.
What is break-even ACoS?: Break-even ACoS is the ACoS at which ad spend exactly equals the profit on the sales it generates. It equals your profit margin before advertising — the share of the price left after product cost and Amazon fees. Below it, ad-driven sales are profitable; above it, they lose money.
What's the difference between ACoS and TACOS?: ACoS divides ad spend by ad-attributed sales only. TACOS divides ad spend by total sales (organic plus paid). ACoS is best for managing individual campaigns; TACOS is the better gauge of whether advertising is genuinely growing the business and building organic rank over time.
How do I calculate ACoS?: ACoS = ad spend ÷ ad-attributed sales, expressed as a percentage. If you spent $20 on ads that produced $100 in sales, your ACoS is 20%. Amazon reports it in your campaign dashboard, but compare it to your break-even ACoS (your margin) to know whether it's actually good.
Should ACoS be high or low?: Lower ACoS means more profit per ad-driven sale, so for an established product you generally want it below break-even. But a deliberately higher ACoS can make sense during a launch or ranking push, where you trade short-term ad loss for organic rank and future sales.

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