Use our free calculators below to calculate ACoS to ROAS, ROAS to ACoS.

E-commerce owners use online advertising to grow their business.

Measuring the performance of these online ads is a key metric.

Advertisers on almost all platforms use ROAS to measure ad performance while Amazon provides ACoS data.

Though both metrics are important marketing KPIs give different insights.

So what does that mean for you as an Amazon seller?

Read this article to understand the basics and conversions for ACos and ROAS.

ACoS stands for Advertising Cost of Sale.

It's a key metric for measuring the efficiency of advertising campaigns on Amazon Seller Central, particularly for sellers using Amazon's Sponsored Products or Sponsored Brands ads.

**What it measures:** ACoS tells you how much you spend on advertising to generate every dollar of sales through those ads.

Here's a breakdown of what ACoS measures:

- Efficiency of Advertising Spend
- Return on Advertising Investment
- Campaign Performance
- Profitability of Ad Campaigns

**Calculation:** ACoS is calculated by dividing your total ad spend by your total sales generated from those ads, then multiplying by 100%.

Here's the formula:

ACoS = (Total Ad Spend / Total Sales from Ads) x 100%

**Interpretation:**

- A low ACoS indicates efficient advertising spend.
- A high ACoS suggests that your advertising spend is eating a significant portion of your revenue.
- ACoS exceeding 100% means that your advertising spend exceeds your advertising revenue, resulting in a loss.

ROAS stands for Return on Ad Spend.

It's a key metric for measuring the efficiency of advertising campaigns across platforms.

**Calculation:** ROAS is calculated by dividing your total sales generated from the advertising campaign by your total ad spend, then multiplying by 100%.

Here's the formula:

ROAS = (Total Sales from Ads / Total Ad Spend) x 100%

**Interpretation:**

- High ROAS indicates efficient advertising spend and strong revenue generation.
- Optimal ROAS aligns advertising spending with revenue goals for balanced returns.
- Low ROAS signals inefficiencies in turning advertising spending into revenue.
- Negative ROAS implies advertising spending exceeds revenue, leading to losses.
- Comparative ROAS analysis helps identify trends and optimize advertising strategies.

You can easily calculate ROAS from ACoS using a simple formula. Here is how

ROAS = 100 / ACoS

For example, if your ACoS is 20%, your ROAS would be 500%.

You can easily calculate ACoS from ROAS using a simple formula. Here is how

ACoS = 100 / ROAS

For example, if your ROAS is 500%, your ACoS would be 20%.

ACoS and ROAS are important metrics to measure advertisement campaign performance.

However, they provide different insights

**Then, Which metric should I use?**

Use ACOS when you want to understand the profitability of your campaigns, especially across product categories.

A lower ACOS is better because it means you're spending less on advertising per sale, potentially leading to higher profits.

Use ROAS when you want to understand the overall effectiveness of your campaigns and the ROI.

A higher ROAS is better because it means your campaigns are generating more revenue compared to the money you've invested.