What is a good ACoS on Amazon?

A good ACoS is below your break-even ACoS, which equals your profit margin before ad spend. Mature products usually run well below break-even, but the right number depends on margin and goal. A 2026 dataset of 69 accounts found a median Sponsored Products ACoS of 28.2%.

How do I calculate break-even ACoS?

Subtract cost of goods, the Amazon referral fee, FBA fee and other per-unit costs from the selling price, then divide by the selling price. The result is your margin before ads, which is your break-even ACoS. Spending more than this per ad sale loses money.

Is 30% ACoS good for Amazon?

It depends on margin. For a product with a 45% margin before ads, 30% ACoS leaves 15% profit on ad sales, which is healthy. For a product with a 25% margin, 30% ACoS loses money on every ad sale. Always compare ACoS with break-even.

What is the difference between ACoS and TACoS?

ACoS divides ad spend by ad-attributed sales. TACoS divides ad spend by total sales, including organic. ACoS shows campaign efficiency; TACoS shows whether advertising is growing the whole business. A falling TACoS with rising sales is a good sign.

Why is my ACoS so high?

Common causes are low conversion rate from weak listings or price, bids or placement adjustments that are too high, broad and automatic campaigns without enough negatives, and new campaigns that have not collected enough data yet. Check conversion rate first, because it has the biggest effect.

What Is a Good ACoS for Amazon? 2026 Targets by Margin

What changed: ACoS = ad spend / ad sales; good means below break-even
When: Updated October 2026
Who it affects: Every seller and vendor running Amazon ads
What to do: Calculate break-even ACoS per product, then set targets by goal

Key takeaways

Break-even ACoS equals your margin before ads; a good ACoS sits below it.
Benchmarks vary widely: one 2026 dataset's middle half ran from 16.0% to 63.1%.
Set targets by goal per product and check TACoS so ACoS cuts do not shrink the business.

What is ACoS?

ACoS, advertising cost of sales, is ad spend divided by the sales those ads generated, shown as a percentage. Amazon's own example: $5 of spend that drives $25 of sales is a 20% ACoS. ROAS is the same ratio upside down, so 20% ACoS equals a 5.0 ROAS.

ACoS only counts sales Amazon attributes to an ad within its window, so it says nothing about organic sales the ads may help create. That is why it should always be read next to TACoS. Our Amazon advertising metrics guide covers both.

How to calculate break-even ACoS

Break-even ACoS is the point where ad spend uses up all the profit on the sale. It equals the profit margin before advertising: selling price minus cost of goods, Amazon referral fee, FBA fee and other per-unit costs, divided by selling price.

Example: a $40 product with $12 cost of goods, a $6 referral fee and a $8 FBA fee leaves $14 of profit before ads, a 35% margin. Its break-even ACoS is 35%. At 35% ACoS each ad sale makes nothing; at 25% it keeps $4 of profit; at 45% it loses $4. Check current fees for your products in Seller Central or our guide to Amazon FBA fees.

Margin before ads = price minus COGS, referral fee, FBA fee and other unit costs
Break-even ACoS = margin before ads divided by price
Target ACoS = break-even minus the profit you want to keep

Break-even ACoS examples

	25% margin	35% margin	50% margin
Break-even ACoS	25%	35%	50%
Profit target	15% to 20%	20% to 28%	30% to 40%
30% ACoS result	Loss	Profit	Strong profit

What ACoS benchmarks look like in 2026

Measured benchmarks are rare, and most published averages come from tool vendors. One 2026 dataset from WisePPC, covering 69 managed accounts from April to June 2026, found a median Sponsored Products ACoS of 28.2%, with the middle half of accounts between 16.0% and 63.1%. That spread shows why a single industry average is a poor target. A 40% ACoS is a loss for a 25% margin product and a profit for a 55% margin one.

Good ACoS by goal: launch, growth and profit

The right target also depends on what the campaign is for. Set a different target for each job, and give each job its own campaign.

Launch and rank: ACoS can sit at or above break-even for a planned period to build sales velocity and reviews
Growth: ACoS near break-even to win share while TACoS stays stable or falls
Profit: ACoS well below break-even on mature products and exact keywords
Brand defense: branded keywords usually run at low ACoS and protect your listings from competitors

Why TACoS matters more than ACoS

A campaign can hit its ACoS target while the business shrinks, for example by cutting spend on keywords that were driving organic rank. TACoS, ad spend divided by total sales, catches this. If TACoS falls while total sales rise, ads are building organic demand. If TACoS rises month after month, ads are renting sales the listing cannot hold. Our guide to ACoS vs TACoS goes deeper.

How to set ACoS targets, step by step

Do this once per product, then refresh whenever price or fees change.

List price, cost of goods and all Amazon fees per product
Calculate margin before ads, which is break-even ACoS
Decide the goal for each product: launch, growth or profit
Set a target ACoS for that goal below or near break-even
Turn the target into a maximum bid using order value and conversion rate
Review monthly against ACoS, TACoS and profit

1Price and costs
COGS plus all Amazon fees
2Break-even
Margin before ads
3Pick a goal
Launch, growth or profit
4Set target
At or below break-even
5Review monthly
ACoS, TACoS, profit

How to lower a high ACoS

If ACoS sits above target, find the cause before cutting bids. A low conversion rate means the listing or price is the problem; a high CPC with good conversion means bids are too high; a broad spread of irrelevant search terms means negatives are missing. Our guides on how to optimize Amazon PPC and Amazon PPC bidding strategy cover each fix.

Add negatives for terms that spend without converting
Move proven terms to exact match with tighter bids
Improve images, reviews and price to raise conversion
Lower placement adjustments that are not paying back

Is a low ACoS always good?

No. A very low ACoS often means you are only bidding on branded or long tail terms and missing the bigger category searches where new customers shop. If ACoS is far below break-even and TACoS is rising, you are probably under-investing. Raising bids on profitable category keywords can grow total sales and profit, even though ACoS goes up.

How PPC Spider sets ACoS targets

PPC Spider sets every target ACoS from the product's margin after fees, and SpiderOS caps bids so no keyword can buy a loss by accident. It is how every Amazon PPC management plan runs. Request a free Amazon audit to see break-even ACoS for your top products.

Sources

Amazon Ads: Frequently asked questions (advertising.amazon.com/resources/faq)
WisePPC: Amazon Sponsored Products benchmarks 2026 (wiseppc.com/blog/amazon-sponsored-products-benchmarks/)
Intentwise: Explained, how does Amazon attribute ad sales? (intentwise.com/blog/explained-how-does-amazon-attribute-ad-sales)

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