> ## 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 Purchase: Track Ad Acquisition Cost

> Track your Meta Cost per Purchase to measure advertising efficiency. See how much you spend on average for each purchase attributed to your Meta campaigns.

<Tip>
  Meta Cost per Purchase measures how much you spend on average for each purchase attributed to your Meta ads.
</Tip>

## Formula

<Info>
  **Meta Cost per Purchase** = **Meta Spend** ÷ **Meta Purchases**
</Info>

### Formula Components

| Metric                                                                                    | Definition                                 |
| ----------------------------------------------------------------------------------------- | ------------------------------------------ |
| [**Meta Spend**](/reference/metrics/advertising/meta/meta-spend/meta-spend)               | Total amount spent on Meta advertising     |
| [**Meta Purchases**](/reference/metrics/advertising/meta/meta-conversions/meta-purchases) | Number of purchases attributed to Meta ads |

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

***

## Example

Your skincare brand spent **\$2,450** on Meta ads in March and drove **98 purchases**.

| Metric                | Value       | Insight                    |
| --------------------- | ----------- | -------------------------- |
| Ad Spend              | \$2,450     | Total Meta budget consumed |
| Purchases             | 98          | Orders attributed to Meta  |
| **Cost per Purchase** | **\$25.00** | Average acquisition cost   |

***

## How It Works

Meta tracks purchases using pixel events and Conversions API data. When a user who saw or clicked your ad completes a purchase within the attribution window, Meta credits that sale to the campaign. This metric divides your total spend by those attributed purchases.

***

## When to Use

| Scenario                     | Action                                            |
| ---------------------------- | ------------------------------------------------- |
| Compare campaign efficiency  | Lower cost per purchase = more efficient spend    |
| Set target acquisition costs | Benchmark against your average order value        |
| Identify underperforming ads | Pause ads with cost per purchase above target     |
| Scale profitable campaigns   | Increase budget on ads with low acquisition costs |

***

## Related Metrics

| Metric                                                                                | Relationship                              |
| ------------------------------------------------------------------------------------- | ----------------------------------------- |
| [Meta Purchases](/reference/metrics/advertising/meta/meta-conversions/meta-purchases) | 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)              | Alternative name for cost per acquisition |