What Is a Good ACOS on Amazon and How to Calculate It

ACOS, ROAS, TACoS: Three Metrics, One Story

Before you can set a target, you need to know which metric you're actually optimising. These three get conflated constantly, but they measure different things.

• ACOS (Advertising Cost of Sales): Ad spend divided by ad-attributed revenue, expressed as a percentage. An ACOS of 25% means you spent $0.25 for every $1.00 of ad revenue.
• ROAS (Return on Ad Spend): The inverse. Ad revenue divided by ad spend. A 25% ACOS = a 4x ROAS. Same data, different framing. Amazon's console reports ACOS; many third-party tools report ROAS.
• TACoS (Total Advertising Cost of Sales): Ad spend divided by total revenue (organic + ad-attributed). This is the metric that tells you whether your ads are actually building your business or just propping it up.

Here's where it gets interesting. You can have a rising ACOS and a falling TACoS at the same time. That happens when your ad spend is generating enough organic ranking momentum that total revenue grows faster than ad cost. This is exactly what a well-run launch looks like. If you're only watching ACOS, you'll panic and cut bids right when the flywheel is starting to spin.

TACoS is the metric we obsess over at Hyperzon when managing accounts through growth phases. A brand we scaled saw ACOS hold steady at 35% for twelve weeks while TACoS dropped from 18% to 9%, because organic sales tripled. The ads were doing their job. ACOS alone would never have told that story. For a deeper look at how to evaluate ad profitability, see our guide on judging ads by profit.

How to Calculate Your Break-Even ACOS

Your break-even ACOS is the ceiling above which every ad-attributed sale loses money. Calculating it is straightforward, but most sellers get it wrong because they forget a cost line.

1. List your selling price: Use the actual average selling price after coupons and promotions, not the sticker price. If you run a 10% coupon, your effective price is lower.
2. Sum every non-ad cost: Product cost (landed), Amazon referral fee (typically 15%), FBA fee or fulfilment cost, return rate cost (multiply your return rate by the per-unit cost of a return), and any subscription or software fees allocated per unit.
3. Subtract total costs from selling price: The result is your pre-ad profit per unit.
4. Divide pre-ad profit by selling price: That percentage is your break-even ACOS.

Example: you sell a supplement for $34.99. Landed cost is $6.50, referral fee is $5.25, FBA fee is $5.10, and returns cost you roughly $0.70 per unit on average. Total non-ad costs: $17.55. Pre-ad profit: $17.44. Break-even ACOS: 49.8%.

That's a healthy margin. It gives you room to run aggressive campaigns during a launch without drowning. Compare that to a commodity product selling for $12.99 with $9.80 in all-in costs. Pre-ad profit of $3.19 means a break-even ACOS of 24.6%. Much less room. Every bid decision matters more.

If you haven't done this calculation for every ASIN in your catalogue, stop reading and do it now. Everything downstream depends on this number. For a step-by-step process on tightening bids once you know your target, our ACOS optimisation guide walks through the full workflow.

Why "Good" ACOS Changes with Your Goal

A single ACOS target for all campaigns, all ASINs, all phases of the product lifecycle is a mistake. Your target should shift based on what the business actually needs right now.

Launch Phase

New products have no reviews, no organic rank, and no sales history. Amazon's algorithm needs sales velocity signals to give you visibility, and ads are the fastest way to generate those signals. During a launch, your ACOS target should be at or above break-even. Sometimes significantly above it.

A 60-80% ACOS on a new ASIN in weeks one through four is common and often correct. You're buying ranking, not profit. The metric to watch is TACoS: is your organic share of total revenue growing week over week? If yes, the high ACOS is working. If organic stays flat after six weeks of heavy spend, the problem is usually the listing (conversion rate), not the ad strategy. Optimising your listing conversion rate will do more than adjusting bids.

Our product launch playbook maps out week-by-week ACOS expectations across a sixteen-week timeline so you know when to push and when to pull back.

Growth Phase

The product has reviews, decent organic rank, and stable conversion. The goal shifts from "get visible" to "grab market share efficiently." Target ACOS here sits 5-15 points below break-even. You're still spending aggressively relative to mature brands, but every campaign should be contribution-margin positive.

This is where campaign segmentation matters most. Your exact-match branded campaigns might run at 8% ACOS. Your broad-match category campaigns might run at 35%. Blending them into a single ACOS number hides the fact that you're overspending on one and underspending on another. Segment by match type, by funnel stage, and by ASIN. Evaluate each segment against its own target.

Profit Phase

Established ASINs with strong organic rank and repeat purchase rates. The goal is maximum contribution margin from ads. Target ACOS is typically 15-25 points below break-even, and total ad spend as a percentage of revenue (TACoS) should be in the single digits.

At this stage, you're pruning: killing keywords that convert but at poor margins, shifting budget toward Sponsored Brands and Sponsored Display for defensive positioning, and harvesting the organic momentum your earlier investment created.

When a High ACOS Is the Right Call

Operators who reflexively cut any campaign above 30% ACOS are leaving growth on the table. There are specific situations where tolerating (or targeting) a high ACOS makes strategic sense.

• Ranking on a high-volume keyword: If you're position 40 on a keyword that does 50,000 searches per month, spending at 70% ACOS to push onto page one can be worth it. The organic revenue from holding a top-five position far exceeds the short-term ad loss. Calculate the expected organic revenue gain at the target rank, then compare it to the ad investment required. If the payback period is under 90 days, go.
• Competitive defence: A new competitor enters your category with aggressive pricing and heavy ad spend. Letting them take your keyword positions is expensive to reverse. Spending at break-even or above for 4-6 weeks to hold position is often cheaper than recapturing rank after you've lost it.
• New-to-brand customer acquisition: Amazon's DSP and AMC reporting can tell you what percentage of your ad-attributed sales come from new-to-brand customers. If your product has a high repeat purchase rate (supplements, consumables, pet products), a high first-purchase ACOS is justified because customer lifetime value is three to five times the initial order value.
• Sponsored Brands Video and top-of-funnel campaigns: These placements drive brand awareness and consideration. Measuring them on the same ACOS yardstick as Sponsored Products exact match campaigns is like measuring a billboard by direct-response conversion. Look at branded search volume lift, detail page view rate, and new-to-brand percentage instead.

The common thread: high ACOS is justified when there's a measurable downstream payoff that compensates for the short-term inefficiency. "Measurable" is the key word. If you can't track the organic rank gain, the branded search lift, or the repeat purchase rate, you're spending on faith, and faith is not a PPC strategy.

The Numbers Behind Category Benchmarks

Benchmarks are useful as sanity checks, not as targets. Data from Jungle Scout and Statista shows wide variance by category:

• Supplements and health: Average ACOS of 25-35%. High competition, strong margins on premium brands, razor-thin margins on commodity products.
• Home and kitchen: Average ACOS of 20-30%. Mid-range margins, seasonal spikes during Q4.
• Beauty and personal care: Average ACOS of 18-28%. Repeat purchase rates soften the impact of higher acquisition costs.
• Electronics and accessories: Average ACOS of 12-20%. Lower margins demand tighter control.

If your ACOS is 10 points above the category average and you've been running ads for more than 90 days, something structural is off. It could be a listing conversion problem, poor keyword targeting, or bidding on terms where you can't compete on price. Diagnose before optimising. Don't just lower bids.

How to Actually Set Your Target

1. Calculate break-even ACOS per ASIN: Use the method above. Do it for every product, because margins vary across your catalogue.
2. Assign a goal to each ASIN: Launch, growth, or profit. The goal determines how far below (or above) break-even your target sits.
3. Set campaign-level targets: Branded exact match gets a tighter target. Broad match prospecting gets a looser one. Sponsored Brands Video gets evaluated on different KPIs entirely.
4. Review TACoS weekly: ACOS tells you about ad efficiency. TACoS tells you about business efficiency. If TACoS is improving, your ads are building organic presence. If TACoS is flat while ACOS drops, you might just be spending less without gaining anything.
5. Recalibrate monthly: Costs change. FBA fees increase. Your landed cost shifts with exchange rates or supplier negotiations. Update your break-even calculation whenever inputs change.

This process sounds simple. Executing it across a portfolio of 30, 50, or 200 ASINs with different margins, different lifecycle stages, and different competitive dynamics is where most in-house teams get overwhelmed.

Stop Chasing a Single Number

The question "what is a good ACOS" has a boring answer: it depends. The interesting question is whether your ACOS targets are aligned to your margin, your lifecycle stage, and your strategic objectives. A 50% ACOS can be brilliant. A 15% ACOS can be wasteful if it means you're not spending enough to capture available demand.

Run your break-even calculation. Assign the right goal to each ASIN. Watch TACoS, not just ACOS. Then adjust with the confidence of someone who knows exactly what each ad dollar is supposed to do.

If your ACOS targets feel like guesswork, they probably are. Hyperzon builds margin-based PPC strategies that align ad spend to your actual unit economics and growth goals. Get a free Amazon audit.

Article was originally published on 23 October, 2026