What Is a Good ACoS on Amazon? How to Set the Right Target

A good ACoS on Amazon is one that's below your break-even ACoS (your profit margin before ad costs) by enough to meet your profit goal, while still letting the product grow. For a product with a 40% margin, a 25% to 30% ACoS might be excellent. For a product with a 20% margin, the same ACoS loses money on every ad sale.

That's why copying someone else's 'good ACoS' rarely works. This guide shows how to set a target that fits your numbers, how to adjust it by product stage, and when it makes sense to run above it.

Start with break-even ACoS

Break-even ACoS is the point where ad spend equals the profit a sale would have made without ads. The formula is:

Break-even ACoS = (Price - product cost - Amazon fees - other variable costs) / Price

If a product sells for $30 and you keep $10.50 after landed cost, referral fee, FBA fee, and inbound shipping, break-even ACoS is $10.50 / $30 = 35%. Our break-even ACoS formula post walks through each cost line, and the break-even ACoS calculator does it for you.

Turn break-even into a target

Your target ACoS is break-even minus the profit you want each ad sale to earn. Different goals lead to different targets:

These are starting points, not rules. What matters is that you choose a target on purpose and review it as conditions change.

Adjust the target by product stage

Launch

A new listing has no reviews, no sales history, and little organic visibility. Ads may be its only source of traffic. Many sellers accept an ACoS above break-even here to generate sales velocity and reviews. Set a time limit (for example 60 to 90 days) and a total budget, so the launch doesn't quietly become a permanent loss. Our new product launch guide covers this phase.

Growth

Once the product has reviews and some organic rank, move the target toward break-even and start harvesting the keywords that convert best. You're still investing, but every sale should be close to paying for itself.

Mature

Established products with strong organic rank can run a lower target ACoS. You're protecting share, not buying it. Watch TACoS as well: if you cut ad spend too far, organic rank can slip.

Liquidation or end of life

If you're clearing stock, ACoS matters less than moving units at an acceptable total margin. Some sellers raise the target temporarily to sell through before long-term storage fees apply.

Different targets for different campaigns

One target for the whole account is simple but blunt. Most accounts do better with targets by campaign purpose:

• Branded keywords (your brand name): usually convert very well, so ACoS tends to be low. Keep bids sensible and protect the placement.
• Core non-branded keywords: your main growth engine. Target near your balanced goal.
• Competitor targeting (their ASINs or brand names): often converts lower. Accept a higher ACoS only if you're winning new customers.
• Discovery and auto campaigns: their job is finding new terms. Judge them partly on how many winners they produce.

A worked example

You sell a $28 kitchen scale. Landed cost is $6, referral fee (15%) is $4.20, FBA fee is $4.80, and other variable costs are $1. Profit before ads: $28 - $16 = $12. Break-even ACoS: $12 / $28 = 42.9%.

Profit per ad sale = $12 - (target ACoS x $28). At 30%, ads cost $8.40 per sale, leaving $3.60. At 50%, ads cost $14, a $2 loss. Seeing the dollar figure next to each target makes the trade-off concrete.

Signs your target is wrong

• Too low: impressions and spend are tiny, campaigns rarely use their budget, and total sales are flat. You're likely missing profitable sales.
• Too high: ACoS sits near or above break-even with no clear growth in organic sales or TACoS improvement.
• Mismatched: one target across products with very different margins, so low-margin items lose money while high-margin items are under-advertised.

What about industry averages?

You'll see various 'average ACoS' figures online. Amazon doesn't publish an official cross-category average, and figures from third parties depend heavily on who's in their sample. Margins, price points, and competition vary so much between categories that an average tells you little about your product. Use your own break-even number as the anchor.

A monthly target review

Targets drift out of date as prices, fees, and competition change. Once a month, run through these questions for each product:

1. Has the sale price, landed cost, or any Amazon fee changed? If so, recalculate break-even ACoS.
2. What stage is the product in now? A product that finished its launch should move to a growth target.
3. Is TACoS moving in the right direction? Falling TACoS with rising sales suggests the target is working.
4. Are campaigns spending their budgets? Consistent underspending at target suggests bids are too cautious.
5. Are there campaigns with a different purpose (brand, competitor, discovery) that need their own target?

Write the answers down next to the new target. When results change next month, you'll know whether it was the market or your settings.

Why targets and organic rank are linked

Ad sales on a keyword appear to support organic placement for that keyword over time, which is why sellers often run a slightly higher target on the few keywords that matter most for ranking. Amazon doesn't publish exactly how this works, so treat it as something to test: raise the target on one or two core terms, watch organic position and TACoS for several weeks, and keep the change only if total sales improve. More in how Amazon PPC affects organic rank.

Putting targets into practice

Once you have a target, turn it into bids. A keyword's maximum profitable bid is target ACoS x conversion rate x average order value. With a 30% target, 10% conversion, and a $28 price, that's $0.84. Then review weekly: lower bids on keywords running well above target, raise bids on keywords comfortably below it that are limited by impressions. The PPC bid calculator handles the formula.

AdSpark is built around this idea: you set a target ACoS per product or campaign, and its bid optimizer adjusts bids continuously toward it, with every change logged and reversible. If ACoS is your main pain point right now, see common Amazon PPC mistakes for the usual culprits.

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