> ## 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.

# Cost per Complete Registration: Measure Registration Efficiency

> Track cost per complete registration for your marketing campaigns. Measure ad spend efficiency for registration events tracked by the Upstack pixel.

<Tip>
  Average ad spend per registration event tracked by the Upstack pixel—measuring how efficiently your campaigns drive account signups and user registrations.
</Tip>

## Formula

<Info>
  **Cost per Complete Registration** = **Channel Spend** ÷ **Complete Registration Events**
</Info>

### Formula Components

| Metric                                                                    | Definition                                                  |
| ------------------------------------------------------------------------- | ----------------------------------------------------------- |
| [**Channel Spend**](/reference/metrics/advertising/blended/blended-spend) | Total advertising spend across all connected ad platforms   |
| **Complete Registration Events**                                          | Total registration completions tracked by the Upstack pixel |

| Metadata        |                         |
| --------------- | ----------------------- |
| **Type**        | Currency                |
| **Data Source** | [Upstack Pixel](/pixel) |
| **Aggregation** | Ratio                   |

***

## Example

Your store spent **\$12,000 on ads** this month driving users to your registration flow. The Upstack pixel tracked registration completions across channels:

| Channel    | Spend        | Registrations | Cost per Registration |
| ---------- | ------------ | ------------- | --------------------- |
| Meta Ads   | \$6,500      | 325           | \$20.00               |
| Google Ads | \$4,000      | 180           | \$22.22               |
| TikTok Ads | \$1,500      | 95            | \$15.79               |
| **Total**  | **\$12,000** | **600**       | **\$20.00**           |

**Cost per Complete Registration** = \$12,000 ÷ 600 = **\$20.00**

***

## How It Works

This metric divides your total advertising spend by complete registration events tracked by the Upstack pixel. A CompleteRegistration event fires when a visitor finishes creating an account or completing a signup flow. Use this metric to evaluate how efficiently your campaigns acquire registered users who can later be nurtured into paying customers.

***

## When to Use

| Scenario               | Action                                                               |
| ---------------------- | -------------------------------------------------------------------- |
| Registration campaigns | Measure cost efficiency for ads driving account signups              |
| Channel comparison     | Identify which platforms deliver registrations most cost-effectively |
| Budget allocation      | Shift spend toward channels with lower registration costs            |
| Funnel optimization    | Compare registration CPAs across audiences and creatives             |

***

## Related Metrics

| Metric                                                                                           | Relationship                                |
| ------------------------------------------------------------------------------------------------ | ------------------------------------------- |
| [Complete Registration Value](/reference/metrics/funnel/conversions/complete-registration-value) | Total monetary value of registration events |
| [Blended Spend](/reference/metrics/advertising/blended/blended-spend)                            | Total ad spend used in the cost calculation |
| [Cost per Lead](/reference/metrics/funnel/conversions/cost-per-lead)                             | Similar acquisition metric for lead events  |

[See all Conversions metrics →](/reference/metrics/funnel/conversions)