> ## 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 Reaction: Average Cost Per Ad Reaction Across Platforms

> Track your average cost per reaction across Meta, Google, and TikTok ads. Compare cross-platform reaction efficiency and optimize ad spend allocation.

<Tip>
  Blended Cost Per Reaction measures how much you spend on average for each reaction your ads receive across all connected advertising platforms.
</Tip>

## Formula

<Info>
  **Blended Cost Per Reaction** = **Blended Spend** ÷ **Blended Reactions**
</Info>

### Formula Components

| Metric                                                                                               | Definition                                                |
| ---------------------------------------------------------------------------------------------------- | --------------------------------------------------------- |
| [**Blended Spend**](/reference/metrics/advertising/blended/blended-spend/blended-spend)              | Total ad spend across all platforms                       |
| [**Blended Reactions**](/reference/metrics/advertising/blended/blended-engagement/blended-reactions) | Total reactions (likes, loves, etc.) 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 spent **\$9,600** and received **8,000 reactions** last month:

| Platform    | Spend       | Reactions | Cost/Reaction |
| ----------- | ----------- | --------- | ------------- |
| Meta Ads    | \$5,400     | 5,400     | \$1.00        |
| TikTok Ads  | \$2,800     | 2,100     | \$1.33        |
| Google Ads  | \$1,400     | 500       | \$2.80        |
| **Blended** | **\$9,600** | **8,000** | **\$1.20**    |

***

## How It Works

Blended Cost Per Reaction divides total ad spend by the sum of all reactions across Meta, Google, and TikTok. This shows how efficiently your campaigns generate emotional responses. Lower values indicate more cost-effective engagement.

***

## When to Use

| Scenario                      | Action                                                       |
| ----------------------------- | ------------------------------------------------------------ |
| Measuring emotional ROI       | Compare cost to generate reactions across platforms          |
| Optimizing brand awareness    | Prioritize platforms with lower cost per reaction            |
| Evaluating creative resonance | Test which creatives drive reactions at lower cost           |
| Allocating engagement budgets | Shift spend toward platforms with better reaction efficiency |

***

## Related Metrics

| Metric                                                                                                               | Relationship                                   |
| -------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------- |
| [Blended Spend](/reference/metrics/advertising/blended/blended-spend/blended-spend)                                  | Numerator — total cost across platforms        |
| [Blended Reactions](/reference/metrics/advertising/blended/blended-engagement/blended-reactions)                     | Denominator — total reactions across platforms |
| [Blended Cost Per Engagement](/reference/metrics/advertising/blended/blended-engagement/blended-cost-per-engagement) | Sibling metric — cost per total engagement     |

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