> ## 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.

# Meta Cost per Add to Cart: Purchase Intent Efficiency

> Track Meta Cost per Add to Cart to measure purchase intent efficiency. Calculate how much you spend to generate each add-to-cart action from Meta ads.

<Tip>
  Meta Cost per Add to Cart measures the average spend per add-to-cart event from your Meta ads, indicating purchase intent acquisition efficiency.
</Tip>

## Formula

<Info>
  **Meta Cost per Add to Cart** = **Meta Spend** ÷ **Meta Add to Carts**
</Info>

### Formula Components

| Metric                                                                                          | Definition                                         |
| ----------------------------------------------------------------------------------------------- | -------------------------------------------------- |
| [**Meta Spend**](/reference/metrics/advertising/meta/meta-spend/meta-spend)                     | Total amount spent on Meta advertising             |
| [**Meta Add to Carts**](/reference/metrics/advertising/meta/meta-conversions/meta-add-to-carts) | Count of add-to-cart events attributed to Meta ads |

| Metadata        |                                   |
| --------------- | --------------------------------- |
| **Type**        | Currency                          |
| **Data Source** | [Meta Ads](/sources/facebook-ads) |
| **Aggregation** | Ratio                             |

***

## Example

Your retargeting campaign spent **\$3,500** on Meta ads last month and generated **1,750 add-to-carts**.

| Metric               | Value   | Calculation                       |
| -------------------- | ------- | --------------------------------- |
| Meta Spend           | \$3,500 | Total spent on Meta               |
| Add to Carts         | 1,750   | Cart additions attributed to Meta |
| Cost per Add to Cart | \$2.00  | \$3,500 ÷ 1,750                   |

***

## How It Works

Cost per Add to Cart divides your total Meta ad spend by the number of add-to-cart events tracked via the Meta Pixel or Conversions API. An add-to-cart event fires when someone adds a product to their shopping cart after engaging with your ad. Lower cost per add-to-cart indicates more efficient purchase intent generation.

***

## When to Use

| Scenario                         | Action                                                            |
| -------------------------------- | ----------------------------------------------------------------- |
| Evaluating mid-funnel efficiency | Compare cost per ATC across campaigns to find top performers      |
| Budget allocation                | Shift spend toward campaigns with lower cost per add-to-cart      |
| Benchmarking intent costs        | Track cost per ATC trends to identify efficiency changes          |
| Optimizing prospecting           | Use cost per ATC when direct purchases are too few to optimize on |

***

## Related Metrics

| Metric                                                                                      | Relationship                                       |
| ------------------------------------------------------------------------------------------- | -------------------------------------------------- |
| [Meta Add to Carts](/reference/metrics/advertising/meta/meta-conversions/meta-add-to-carts) | The denominator in this calculation                |
| [Meta Spend](/reference/metrics/advertising/meta/meta-spend/meta-spend)                     | The numerator in this calculation                  |
| [Meta CPA](/reference/metrics/advertising/meta/meta-efficiency/meta-cpa)                    | Similar efficiency metric for purchase conversions |

[See all Meta Conversions metrics →](/reference/metrics/advertising/meta/meta-conversions)