> ## 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 Share: Measure Ad Sharing Efficiency

> Track how much you spend for each share of your ads across all platforms. Optimize viral potential and social engagement cost-efficiency.

<Tip>
  Blended Cost Per Share measures the average cost to generate one share of your ads across all connected advertising platforms.
</Tip>

## Formula

<Info>
  **Blended Cost Per Share** = **Blended Spend** ÷ **Blended Shares**
</Info>

### Formula Components

| Metric                                                                                         | Definition                                               |
| ---------------------------------------------------------------------------------------------- | -------------------------------------------------------- |
| [**Blended Spend**](/reference/metrics/advertising/blended/blended-spend/blended-spend)        | Total advertising spend aggregated across all platforms  |
| [**Blended Shares**](/reference/metrics/advertising/blended/blended-engagement/blended-shares) | Total shares of your ads aggregated across all platforms |

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

***

## Example

Your campaigns generated **2,500 shares** across all platforms with a total spend of **\$5,000**.

| Platform    | Spend       | Shares    | Cost Per Share |
| ----------- | ----------- | --------- | -------------- |
| Meta        | \$2,500     | 1,800     | \$1.39         |
| TikTok      | \$2,500     | 700       | \$3.57         |
| **Blended** | **\$5,000** | **2,500** | **\$2.00**     |

***

## How It Works

Blended Cost Per Share divides your total ad spend by the total number of shares across all connected platforms. This gives you a unified view of how efficiently your budget generates viral engagement, regardless of which platform drives the shares.

***

## When to Use

| Scenario                    | Action                                                               |
| --------------------------- | -------------------------------------------------------------------- |
| Comparing viral efficiency  | Benchmark cost per share against industry standards                  |
| Optimizing for shareability | Identify which creative assets generate shares most cost-effectively |
| Budget allocation           | Shift spend toward platforms with lower cost per share               |
| Campaign planning           | Set target cost per share for awareness campaigns                    |

***

## Related Metrics

| Metric                                                                                                               | Relationship                         |
| -------------------------------------------------------------------------------------------------------------------- | ------------------------------------ |
| [Blended Spend](/reference/metrics/advertising/blended/blended-spend/blended-spend)                                  | Numerator in this calculation        |
| [Blended Shares](/reference/metrics/advertising/blended/blended-engagement/blended-shares)                           | Denominator in this calculation      |
| [Blended Cost Per Engagement](/reference/metrics/advertising/blended/blended-engagement/blended-cost-per-engagement) | Broader engagement efficiency metric |

[See all Blended Engagement metrics →](/reference/metrics/advertising/blended/blended-engagement)