Table of Contents
A good ACoS Amazon sellers should aim for usually falls between 25% and 40%, with anything under 25% considered excellent and anything above 40% generally too high. But the number that really matters is whether your ACoS sits below your break-even margin. What is a good ACoS on Amazon comes down to your profit margin, product category, and whether you're chasing efficiency or growth, not what the industry average says.
TL;DR
What ACoS measures | Percentage of ad-attributed revenue you spent on ads. Lower is more efficient. |
Formula | ACoS = (Ad Spend ÷ Ad Sales) × 100 |
General benchmark | Under 25% excellent; 25-40% average; above 40% high |
Break-even ACoS | Equal to your net profit margin after Amazon fees, COGS, and fulfillment |
ACoS ↔ ROAS conversion | 25% ACoS = 4x ROAS, 20% ACoS = 5x ROAS, 33% ACoS = 3x ROAS |
Category range | Electronics 10-20%, Home & Kitchen 20-30%, Beauty 25-35%, Supplements 30-40% |
When higher ACoS is OK | Launches, market-share pushes, when organic halo offsets the ad loss |
When to lower ACoS | Steady-state catalogs, tight margins, post-launch maturity |
What is ACoS on Amazon?
ACoS, or Advertising Cost of Sale, is the percentage of ad-attributed revenue that went to ad spend. Amazon shows it inside Campaign Manager next to spend, clicks, impressions, and CPC.
The formula is straightforward: ACoS = (Ad Spend ÷ Ad Sales) × 100.
Spend $200 on Sponsored Products, generate $1,000 in ad-driven sales, and your ACoS is 20%. Lower means more efficient spend, though lower isn't always the goal.
What is a Good ACoS on Amazon? Industry Benchmarks
There's no single number that works for every seller, but published benchmarks land in three bands.
ACoS range | Read | What it signals |
Under 15% | Excellent | Highly efficient. May indicate room to scale spend. |
15-25% | Strong | Efficient and profitable for most margins |
25-40% | Average | Sustainable. The most common band for healthy sellers. |
Above 40% | High | Optimization needed unless intentionally chasing growth |
BQool's industry analysis frames the same ranges: under 25% is excellent, 25-40% is sustainable for most sellers, and anything above 40% is typically high (Source: BQool).
That said, two sellers running the same ACoS can have completely different profit outcomes. A 35% ACoS on a 50% margin product is healthy; the same 35% on a 30% margin loses money on every sale. A good ACoS on Amazon isn't a universal target. It's a calibration against your own margins.
How to Calculate Your Break-Even ACoS
Break-even ACoS is the lowest ACoS at which your ads stop adding profit. It equals your net margin after all costs.
Formula: Break-even ACoS = Gross Profit ÷ Selling Price
Worked example: a product sells for $30. After unit cost, FBA fees, referral fees, and shipping, you keep $10 in gross profit. Break-even ACoS is $10 ÷ $30 = 33%. Anything below 33% adds profit; anything above leaks money.
This number reframes every campaign decision. Whats a good ACoS in isolation matters less than where it sits against your break-even. Recalculate it each quarter, since fee changes or sourcing shifts can move it overnight (Source: BQool).
Amazon ACoS Benchmarks by Category
ACoS targets shift sharply by category because average order value, bid competition, and conversion rates all vary. Use this as orientation, not a ceiling.
Category | Typical "good" ACoS |
Consumer Electronics | 10%-20% |
Home & Kitchen | 20%-30% |
Beauty & Personal Care | 25%-35% |
Toys & Games | 20%-30% |
Apparel & Accessories | 25%-35% |
Grocery & Gourmet | 25%-35% |
Supplements | 30%-40% |
Health & Household | 20%-30% |
Higher-AOV categories tend to support lower ACoS because each conversion absorbs more cost-per-click. Tight-margin commodity categories run leaner and rely on volume.
ACoS vs ROAS: Which Should You Track?
ACoS and ROAS describe the same data from different angles. ACoS shows how much of your ad sales went to ad cost; ROAS shows how much revenue comes back per dollar spent.
Metric | Formula | Reads as | Best for |
ACoS | Ad Spend ÷ Ad Sales | Percentage (lower is better) | Tactical bid management inside Amazon |
ROAS | Ad Sales ÷ Ad Spend | Multiple (higher is better) | Cross-channel reporting, scaling decisions |
The conversions are direct: 25% ACoS = 4x ROAS, 20% ACoS = 5x ROAS, 33% ACoS = 3x ROAS. Picking one doesn't change performance; it changes how easily you can read it next to other numbers.
When a Higher ACoS Actually Makes Sense
Not every campaign should chase a low number. Sellers running launches or fighting for category share often accept a higher ACoS on purpose.
· Product launches. New ASINs often run 50%+ ACoS for 60-90 days to buy reviews and ranking velocity.
· Market share pushes. Going after a competitor's branded terms can justify ACoS well above break-even.
· Seasonal windows. Prime Day, Q4, and category peaks deserve aggressive bidding while intent is high.
· Organic halo. Ad-driven sales feed velocity, which lifts organic rank, which generates sales outside the ad spend. A break-even ad isn't a bad ad (Source: My Amazon Guy).
How to Lower a High ACoS
If ACoS sits above break-even, the fix is usually structural. Bid tweaks alone rarely move the needle. The bigger levers, when working toward a good ACoS Amazon sellers can rely on:
· Negate non-converting search terms so spend stops bleeding into queries that never close into orders.
· Tighten match types - phrase and exact convert better than broad in most catalogs.
· Move converting search terms from auto into manual exact-match for tighter control over what you're paying for.
· Improve the listing - better hero image, A+ content, and review velocity reduce ACoS by lifting conversion rate. A 5% conversion lift moves ACoS more than a 10% bid cut.
· Dayparting - bid higher during your converting hours, lower during the rest. Most categories have clear windows.
· Cap exploration campaigns at break-even so discovery spend can't run away.
Each lever stacks. Together, they bring a 45% ACoS into the 25-30% band. Platforms like atom11 automate negation, bid adjustment, and hourly dayparting so the work runs continuously, which is where ACoS quietly drifts back up otherwise.
What is a Good ACoS for Amazon PPC at Different Lifecycle Stages
A good ACoS amazon target shifts with product maturity. Running a launch campaign at a steady-state ACoS target is one of the most common ways to stall a new ASIN.
Stage | Target ACoS | Why |
Launch (0-90 days) | 40-60%+ | Buy reviews, velocity, and organic rank position |
Growth (3-12 months) | 30-40% | Scale spend while maintaining profitability |
Mature (12+ months) | 20-30% | Efficiency mode. Tighten keywords, lean on harvested winners. |
Decline / clearance | Variable | Use ads only to support liquidation pricing |
Conclusion
What is a good ACoS amazon sellers should chase? Anything below break-even, ideally with room to spare. The 25-40% industry range is a useful starting frame, but your own margin is the only target that matters. Track ACoS by SKU, set targets that match each product's lifecycle, and most ad waste manages itself.
FAQs
What is a good ACoS for Amazon PPC?
For most sellers, a good ACoS for Amazon PPC sits between 25% and 40%, with under 25% being excellent. The real target should be below your break-even margin, calculated as gross profit divided by selling price.
Is a 30% ACoS good?
A 30% ACoS is profitable if your net margin is higher than 30%. If your margin is 25%, the same 30% ACoS loses money on every order. Benchmark against your own margin, not the industry average.
How do I calculate break-even ACoS?
Break-even ACoS equals gross profit divided by selling price, after Amazon fees, COGS, and fulfillment. A $30 product with $10 gross profit has a 33% break-even ACoS.
Is ACoS the same as ROAS?
No, but they describe the same data. ACoS is ad spend divided by ad sales (a percentage). ROAS is ad sales divided by ad spend (a multiple). 25% ACoS equals 4x ROAS.
What is a good ACoS for new product launches?
Launch ACoS often runs 40-60% or higher for the first 60-90 days. The trade-off is short-term ad loss for long-term organic rank. Pull back to steady-state targets once rank stabilises.
Why is my ACoS so high?
Usually too-broad match types, no negative keywords, bidding on irrelevant search terms, or weak listing conversion. Auto-campaigns running unattended for months are the most common cause.
Should I optimize for ACoS or ROAS?
Use ACoS for in-Amazon tactical decisions and break-even checks. Use ROAS for cross-channel reporting, portfolio scaling, and conversations with marketing leadership.
