Amazon ACoS & ROAS Calculator
Calculate your Amazon Advertising Cost of Sale, Return on Ad Spend, TACoS, break-even ACoS, and more. Know exactly whether your PPC campaigns are profitable.
| ACoS Range | Status | Recommended Action |
|---|---|---|
| < 15% | Excellent | Scale up — increase budget & bids |
| 15% – 25% | Good | Optimize bids & add keywords |
| 25% – 35% | Average | Review keywords & match types |
| 35% – 50% | High | Cut underperforming keywords |
| > 50% | Critical | Pause & restructure campaigns |
What Is ACoS on Amazon?
ACoS stands for Advertising Cost of Sale. It is Amazon's primary metric for measuring PPC advertising efficiency and tells you what percentage of your ad-attributed revenue was spent on advertising. The formula is simple: ACoS equals your total ad spend divided by your total ad revenue, multiplied by 100. A lower ACoS means your campaigns are more cost-efficient, while a higher ACoS means you are spending more to generate each sale.
For example, if you spend $200 on ads and generate $1,000 in ad-attributed sales, your ACoS is 20%. This means you spent 20 cents for every dollar of revenue from ads. Understanding your ACoS is critical because it directly impacts whether your Amazon advertising is profitable or burning cash.
ACoS vs TACoS vs ROAS — Key Differences
Amazon sellers often confuse ACoS, TACoS, and ROAS, but each metric tells a different story. ACoS only considers revenue directly attributed to your ads. TACoS (Total Advertising Cost of Sale) divides your ad spend by your total revenue, including organic sales. This gives a more holistic view because strong PPC campaigns boost organic rankings over time, meaning your ad spend generates more revenue than what shows up in ad reports alone.
ROAS (Return on Ad Spend) is simply the inverse of ACoS. If your ACoS is 25%, your ROAS is 4x, meaning you earn $4 for every $1 spent on ads. Many marketers prefer ROAS because higher numbers are intuitively better, while with ACoS, lower is better. All three metrics are valuable — use ACoS for campaign-level optimization, TACoS for overall business health, and ROAS for comparing Amazon ads to other platforms.
How to Calculate Break-Even ACoS
Your break-even ACoS equals your profit margin before advertising. If your product sells for $30 and your total costs (product, shipping, Amazon fees) are $21, your pre-ad profit margin is 30%. This means your break-even ACoS is 30% — any ACoS below that is profitable, and any ACoS above that means you are losing money on every ad-attributed sale.
Knowing your break-even ACoS is essential for setting campaign targets. Many sellers run high ACoS campaigns during product launches to gain ranking and reviews, then optimize down to a profitable ACoS once they have momentum. Use this calculator to find your exact break-even point and set data-driven bidding targets for every campaign.
Tips to Lower Your Amazon ACoS
Reducing ACoS requires a systematic approach. Start by reviewing your search term reports and adding negative keywords for irrelevant terms eating your budget. Use exact match for proven converting keywords and broad match only for research. Optimize your product listing — better images, bullet points, and A-plus content improve conversion rate, which directly lowers ACoS. Consider dayparting to run ads only during peak converting hours, and regularly adjust bids based on placement performance data from Sponsored Products reports.