# Break-even ACoS Calculator for Amazon | Autron

Free break-even ACoS calculator for Amazon sellers. Enter your price, cost and fees to find the ACoS where an ad sale stops making money, plus the target ACoS for your margin.

URL: https://autron.ai/tools/acos-calculator

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ACoS calculator

Starter

## Break-even ACoS calculator

Your break-even ACoS is your profit margin before ads — the most you can spend per ad sale before it loses money. Enter your price, cost and fees to see it, plus the target ACoS that keeps the margin you want.

Sale price

$

Product cost (COGS)

$

Manufacturing + freight to Amazon, per unit.

Amazon referral fee

%

Most categories are 15%.

FBA / fulfillment fee

$

Per-unit pick, pack and ship.

Net margin you want to keep

%

Used to work out your target ACoS.

Break-even ACoS40.0%Spend above this on ads and the ad-driven sale loses money.

Pre-ad profit / unit$11.99

Target ACoS to keep 20% margin20.0%

Email me the 2026 category ACoS/CPC benchmarks

### Why break-even ACoS is the number that matters

Most sellers track ACoS against last month, not against the point where ads stop paying for themselves. Break-even ACoS fixes that. It is the ceiling: spend more than this per sale and you are buying revenue at a loss. Set your target a few points below it, leave room for the margin you want to keep, and you have a goal that is tied to your actual economics rather than a competitor’s.

Once you know your target, the next questions are how your account performs against your category and whether your overall account is profitable after every cost. Use the [benchmark comparison](https://autron.ai/tools/amazon-ppc-benchmarks) and the [profit and TACoS calculator](https://autron.ai/tools/amazon-ppc-profit-calculator) next.

FAQ

### Common questions

### What is break-even ACoS?

Break-even ACoS is the advertising cost of sales at which an ad-driven order makes exactly zero profit. It equals your profit margin before ad spend: price minus product cost, Amazon referral fee and fulfillment fee, divided by price. Run ads above this ACoS and each ad sale loses money; run below it and you keep the difference.

### What is the difference between break-even ACoS and target ACoS?

Break-even ACoS is the ceiling — the most you can spend on ads per sale before losing money. Target ACoS is the level you actually aim for so you keep a profit. If your break-even ACoS is 35% and you want to keep a 15% net margin on ad sales, your target ACoS is about 20%.

### Is a 25% ACoS good?

It depends entirely on your margins and category. A 25% ACoS is healthy if your break-even ACoS is 40%, and unsustainable if your break-even is 22%. Always read ACoS against your own break-even first, then against your category benchmark.

### How do I lower my ACoS?

In order of impact: add negative keywords for high-click, low-convert search terms; consolidate spend toward phrase and exact match; raise your top-of-search placement modifier; optimise bids continuously rather than weekly; and fix the listing image and title if both CTR and conversion rate are low.

More free tools

### Keep going with the rest of the kit

[Starter

#### Profit & TACoS calculator

Turn revenue, ad spend and costs into net profit, net margin and TACoS — the number that actually tracks ad efficiency.

Open tool→](https://autron.ai/tools/amazon-ppc-profit-calculator)

[Intermediate

#### Benchmark comparison

See how your ACoS, CPC, CTR and conversion rate stack up against the benchmark for your category.

Open tool→](https://autron.ai/tools/amazon-ppc-benchmarks)

[Advanced

#### Search-term n-gram analyzer

Paste your search-term report to find the words and phrases quietly draining budget — and the ones worth doubling down on.

Open tool→](https://autron.ai/tools/amazon-ngram-analyzer)

### Hit your target ACoS on autopilot

Knowing your target ACoS is step one. On Pro, Autron's ad engine holds your campaigns to it automatically, adjusting bids continuously so your ACoS does not drift when the auction moves.

[Run a free PPC audit](https://autron.ai/tools/free-amazon-ppc-audit) [Try Autron free](https://agent.autron.ai/start)