How to Calculate Break-Even ACOS for Amazon PPC
Understanding your numbers is the first rule of Amazon advertising. Many beginners ask: “What is a good ACOS?” The answer depends entirely on your Break-Even ACOS.Don’t know your margin? Use our Break-Even Calculator.
Our ACOS & RoAS Calculator does the heavy lifting for you, but understanding the math behind it will make you a better seller.
What is Break-Even ACOS?
Break-Even ACOS is the specific ACOS percentage where your ad spend equals your profit margin. At this point, you make $0 profit, but you also lose $0. It is the “line in the sand” for your profitability.
Break-Even ACOS = (Selling Price - COGS - FBA Fees) / Selling Price(In other words, it is simply your pre-ad Profit Margin %)
How to Use This Calculator
- Enter Ad Spend & Sales: Input your data from Campaign Manager (7-day or 30-day view).
- Input Profit Margin: Use our Profit Calculator to find your margin before ads. Enter that number here.
- Analyze the Bar:
- If the bar is Green (Actual ACOS < Break-Even), you are making net profit.
- If the bar is Red (Actual ACOS > Break-Even), you are losing money on every sale.
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ACOS vs. RoAS: Which One Matters?
They are mathematical inverses. ACOS (Advertising Cost of Sales) represents cost efficiency (Lower is better). RoAS (Return on Ad Spend) represents investment return (Higher is better).
ACOS = Spend ÷ SalesRoAS = Sales ÷ Spend
For example, an ACOS of 25% is exactly the same as a ROAS of 4.0x.
Break-Even ACOS is exactly equal to your product’s profit margin percentage before advertising. If your product has a 30% margin after manufacturing and FBA fees, your Break-Even ACOS is 30%.
TACoS (Total Advertising Cost of Sales) measures ad spend against your Total Revenue (Organic + Ad Sales). While ACOS measures campaign efficiency, TACoS measures overall business health. A healthy TACoS is usually between 10-15%.
Yes, by manually adding “Negative Keywords” to block irrelevant searches and lowering bids on keywords with low conversion rates. However, as you scale, using tools like Adtomic becomes essential to save time.
Yes, if you want to make a profit. If your Break-Even is 30%, aim for a Target ACOS of 20-25% to ensure you keep some profit. However, for a product launch, you might accept an ACOS equal to or higher than your Break-Even just to gain rank.
