> ## 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 Share: Social Engagement Efficiency

> Measure ad spend efficiency for social share events. Track how much it costs to generate product or content shares from your site visitors.

<Tip>
  Cost per Share measures how much ad spend is required to generate one share event on your site.
</Tip>

## Formula

<Info>
  **Cost per Share** = **Channel Spend** ÷ **Shares**
</Info>

### Formula Components

| Metric            | Definition                                                     |
| ----------------- | -------------------------------------------------------------- |
| **Channel Spend** | Total advertising spend for the channel in the selected period |
| **Shares**        | Total share events tracked by the Upstack pixel                |

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

***

## Example

Your store spent **\$5,000** on Meta ads in January and generated **1,250** share events from visitors.

| Metric             | Value      | Calculation          |
| ------------------ | ---------- | -------------------- |
| Channel Spend      | \$5,000    | Total Meta spend     |
| Share Events       | 1,250      | Total shares tracked |
| **Cost per Share** | **\$4.00** | \$5,000 ÷ 1,250      |

***

## How It Works

Cost per Share is calculated by dividing total channel spend by the number of share events tracked by the [Upstack Pixel](/pixel). Share events are fired when visitors use social sharing functionality on your product pages, blog posts, or other shareable content. Lower cost per share indicates more efficient spend at driving social engagement.

***

## When to Use

| Scenario                               | Action                                                                            |
| -------------------------------------- | --------------------------------------------------------------------------------- |
| Evaluating social campaign performance | Compare cost per share across campaigns to identify which creatives drive sharing |
| Optimizing for virality                | Target campaigns with lower cost per share to maximize organic reach              |
| Measuring content engagement           | Track share costs for content-driven campaigns vs product campaigns               |
| Benchmarking channel efficiency        | Compare share costs across Meta, TikTok, and other social channels                |

***

## Related Metrics

| Metric                                                                                    | Relationship                                        |
| ----------------------------------------------------------------------------------------- | --------------------------------------------------- |
| [Cost per View Content](/reference/metrics/funnel/engagement/cost-per-view-content)       | Compare share costs to product view costs           |
| [Cost per Add to Cart](/reference/metrics/funnel/engagement/cost-per-add-to-cart)         | Share engagement vs purchase intent efficiency      |
| [Cost per Add to Wishlist](/reference/metrics/funnel/engagement/cost-per-add-to-wishlist) | Compare social sharing vs wishlist engagement costs |

[See all Engagement metrics →](/reference/metrics/funnel/engagement)