> ## Documentation Index
> Fetch the complete documentation index at: https://docs.upstackdata.com/llms.txt
> Use this file to discover all available pages before exploring further.

# CM4 ROAS: Operating Profit Return on Ad Spend

> Track CM4 ROAS for your Shopify store. Measure operating profit return per dollar of ad spend.

<Tip>
  CM4 ROAS measures how much operating profit you earn for every dollar spent on advertising—the ultimate ad efficiency metric.
</Tip>

## Formula

<Info>
  **CM4 ROAS** = **CM4** ÷ **Ad Spend**
</Info>

### Formula Components

| Metric                                                                          | Definition                               |
| ------------------------------------------------------------------------------- | ---------------------------------------- |
| [**CM4 (Operating Profit)**](/reference/metrics/orders/contribution-margin/cm4) | Profit after all costs including OPEX    |
| **Ad Spend**                                                                    | Total advertising spend across platforms |

| Metadata        |                                                                                                   |
| --------------- | ------------------------------------------------------------------------------------------------- |
| **Type**        | Multiplier                                                                                        |
| **Data Source** | [Shopify](/sources/shopify), [Meta Ads](/sources/facebook-ads), [Google Ads](/sources/google-ads) |
| **Aggregation** | Ratio                                                                                             |

***

## Example

Your Shopify store has **\$20,000** CM4 and spent **\$25,000** on advertising.

| Component    | Value    | Calculation         |
| ------------ | -------- | ------------------- |
| CM4          | \$20,000 | Operating profit    |
| Ad Spend     | \$25,000 | Advertising cost    |
| **CM4 ROAS** | **0.8x** | \$20,000 ÷ \$25,000 |

***

## How It Works

CM4 ROAS shows true operating profit per ad dollar after all costs. A 0.8x CM4 ROAS means each ad dollar generates only \$0.80 in operating profit. CM4 ROAS below 1x indicates ads don't fully cover their allocation of fixed costs.

***

## When to Use

| Scenario                        | Action                                             |
| ------------------------------- | -------------------------------------------------- |
| Measuring true ad profitability | CM4 ROAS is the ultimate efficiency metric         |
| Investment decisions            | CM4 ROAS > 1x means ads generate net profit        |
| Budget planning                 | Use CM4 ROAS to determine sustainable spend levels |
| Performance benchmarking        | Track CM4 ROAS trends over time                    |

***

## Related Metrics

| Metric                                                     | Relationship                      |
| ---------------------------------------------------------- | --------------------------------- |
| [CM3 ROAS](/reference/metrics/orders/performance/cm3-roas) | Contribution margin per ad dollar |
| [CM4](/reference/metrics/orders/contribution-margin/cm4)   | Total operating profit            |
| [ROAS](/reference/metrics/orders/performance/roas)         | Revenue per ad dollar             |

[See all Performance metrics →](/reference/metrics/orders/performance)