> ## 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 New Customer Cost per Purchase: Acquisition Efficiency

> Track Meta new customer cost per purchase to measure acquisition efficiency. Calculate average ad spend per first-time buyer conversion from Meta campaigns.

<Tip>
  Meta New Customer Cost per Purchase measures how much you spend on Meta ads for each first-time buyer conversion.
</Tip>

## Formula

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

### Formula Components

| Metric                                                                                                              | Definition                                                      |
| ------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------- |
| [**Meta Spend**](/reference/metrics/advertising/meta/meta-spend/meta-spend)                                         | Total amount spent on Meta advertising                          |
| [**Meta New Customer Purchases**](/reference/metrics/advertising/meta/meta-conversions/meta-new-customer-purchases) | Number of purchases by first-time buyers attributed to Meta ads |

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

***

## Example

Your store ran a prospecting campaign in March with **\$12,400 in Meta ad spend** that generated **124 new customer purchases**.

| Metric                 | Value        | Calculation       |
| ---------------------- | ------------ | ----------------- |
| Ad Spend               | \$12,400     | Total Meta spend  |
| New Customer Purchases | 124          | First-time buyers |
| **NC Cost/Purchase**   | **\$100.00** | \$12,400 ÷ 124    |

***

## How It Works

This metric isolates your acquisition efficiency by focusing exclusively on first-time buyers. Meta identifies new customers using the customer information signals you send via the Conversions API. Unlike overall CPA, this filters out repeat purchasers to show true acquisition costs.

***

## When to Use

| Scenario                              | Action                                                      |
| ------------------------------------- | ----------------------------------------------------------- |
| Evaluating prospecting campaigns      | Compare NC cost across ad sets targeting cold audiences     |
| Setting acquisition budgets           | Use as baseline to forecast spend needed for growth targets |
| Comparing to customer LTV             | Ensure acquisition cost stays below customer lifetime value |
| Optimizing creative for new customers | Test which ads drive lowest NC acquisition costs            |

***

## Related Metrics

| Metric                                                                                                          | Relationship                                     |
| --------------------------------------------------------------------------------------------------------------- | ------------------------------------------------ |
| [Meta New Customer Purchases](/reference/metrics/advertising/meta/meta-conversions/meta-new-customer-purchases) | The denominator in this calculation              |
| [Meta Spend](/reference/metrics/advertising/meta/meta-spend/meta-spend)                                         | The numerator in this calculation                |
| [Meta New Customer CPA](/reference/metrics/advertising/meta/meta-efficiency/meta-new-customer-cpa)              | Equivalent metric using standard CPA terminology |