> ## 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.

# Blended Cost per Completed Registration: Aggregate Registration Efficiency

> Track your cost per completed registration across Meta, Google, and TikTok ads combined. Calculate aggregate CPR to optimize signup acquisition efficiency.

<Tip>
  The average cost to acquire one completed account registration across all connected advertising platforms.
</Tip>

## Formula

<Info>
  **Blended Cost per Completed Registration** = [**Blended Spend**](/reference/metrics/advertising/blended/blended-spend/blended-spend) ÷ [**Blended Completed Registrations**](/reference/metrics/advertising/blended/blended-conversions/blended-completed-registrations)
</Info>

### Formula Components

| Metric                                                                                                                            | Definition                                            |
| --------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------- |
| [**Blended Spend**](/reference/metrics/advertising/blended/blended-spend/blended-spend)                                           | Total ad spend across Meta, Google, and TikTok        |
| [**Blended Completed Registrations**](/reference/metrics/advertising/blended/blended-conversions/blended-completed-registrations) | Total registration completions attributed to your ads |

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

***

## Example

Your registration campaigns spent **\$8,000** and captured 400 completed registrations this month:

| Platform    | Spend       | Registrations | Cost per Reg |
| ----------- | ----------- | ------------- | ------------ |
| Meta Ads    | \$4,000     | 200           | \$20.00      |
| Google Ads  | \$2,500     | 125           | \$20.00      |
| TikTok Ads  | \$1,500     | 75            | \$20.00      |
| **Blended** | **\$8,000** | **400**       | **\$20.00**  |

***

## How It Works

Blended Cost per Completed Registration aggregates total ad spend and registration completions across all connected platforms, then calculates the combined cost per registration. This gives you a single efficiency metric for your entire registration program regardless of which platforms you use.

***

## When to Use

| Scenario                     | Action                                                               |
| ---------------------------- | -------------------------------------------------------------------- |
| Setting registration targets | Determine sustainable cost per registration based on customer LTV    |
| Budget planning              | Forecast registration volume based on available spend                |
| Comparing periods            | Track cost per registration trends month-over-month                  |
| Optimizing funnel            | Reduce cost per registration by improving targeting or landing pages |

***

## Related Metrics

| Metric                                                                                                                        | Relationship                                                   |
| ----------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------- |
| [Blended Spend](/reference/metrics/advertising/blended/blended-spend/blended-spend)                                           | Numerator in the formula                                       |
| [Blended Completed Registrations](/reference/metrics/advertising/blended/blended-conversions/blended-completed-registrations) | Denominator in the formula                                     |
| [Blended CPA](/reference/metrics/advertising/blended/blended-efficiency/blended-cpa)                                          | Cost per acquisition (all conversions, not just registrations) |

[See all Blended Conversions metrics →](/reference/metrics/advertising/blended/blended-conversions)