> ## 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 Outbound CTR: External Click-Through Rate

> Track your blended outbound click-through rate across Meta, Google, and TikTok ads. Measure the percentage of impressions that drove traffic to your site.

<Tip>
  Blended Outbound CTR measures the percentage of impressions that resulted in an outbound click—clicks that drove users to your website or app from ad platforms.
</Tip>

## Formula

<Info>
  **Blended Outbound CTR** = ( **Blended Outbound Clicks** ÷ **Blended Impressions** ) × 100
</Info>

### Formula Components

| Metric                                                                                                       | Definition                                             |
| ------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------ |
| [**Blended Outbound Clicks**](/reference/metrics/advertising/blended/blended-clicks/blended-outbound-clicks) | Clicks that drove users from ad platforms to your site |
| [**Blended Impressions**](/reference/metrics/advertising/blended/blended-audience/blended-impressions)       | Total impressions across all advertising channels      |

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

***

## Example

Your campaigns delivered **1,800,000 impressions** and **18,000 outbound clicks** across all channels:

| Metric                   | Value     |
| ------------------------ | --------- |
| Blended Impressions      | 1,800,000 |
| Blended Outbound Clicks  | 18,000    |
| **Blended Outbound CTR** | **1.00%** |

***

## How It Works

Blended Outbound CTR aggregates outbound clicks and impressions from Meta, Google, and TikTok, then calculates the rate at which ad views converted into external site visits. Unlike standard CTR, this focuses only on clicks that left the ad platform.

***

## When to Use

| Scenario                     | Action                                                      |
| ---------------------------- | ----------------------------------------------------------- |
| Measuring traffic efficiency | Compare to standard CTR to see external vs total engagement |
| Evaluating landing page CTAs | Low outbound CTR may indicate weak calls-to-action          |
| Budget optimization          | Allocate spend to platforms with higher outbound CTR        |

***

## Related Metrics

| Metric                                                                                                   | Relationship                            |
| -------------------------------------------------------------------------------------------------------- | --------------------------------------- |
| [Blended Outbound Clicks](/reference/metrics/advertising/blended/blended-clicks/blended-outbound-clicks) | Numerator in outbound CTR calculation   |
| [Blended Impressions](/reference/metrics/advertising/blended/blended-audience/blended-impressions)       | Denominator in outbound CTR calculation |
| [Blended CTR](/reference/metrics/advertising/blended/blended-clicks/blended-ctr)                         | Total CTR including in-platform clicks  |

[See all Blended Clicks metrics →](/reference/metrics/advertising/blended/blended-clicks)