> ## 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 Subscription: Ad Efficiency Metric

> Track cost per subscription sign-up across Meta, Google, and TikTok ads. Measure blended acquisition efficiency for subscription-based products.

<Tip>
  Blended Cost per Subscription measures how much you spend across all ad platforms to acquire one subscription sign-up.
</Tip>

## Formula

<Info>
  **Blended Cost per Subscription** = [**Blended Spend**](/reference/metrics/advertising/blended/blended-spend/blended-spend) ÷ [**Blended Subscriptions**](/reference/metrics/advertising/blended/blended-conversions/blended-subscriptions)
</Info>

### Formula Components

| Metric                                                                                                        | Definition                                                              |
| ------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------- |
| [**Blended Spend**](/reference/metrics/advertising/blended/blended-spend/blended-spend)                       | Total advertising spend aggregated across all connected ad platforms    |
| [**Blended Subscriptions**](/reference/metrics/advertising/blended/blended-conversions/blended-subscriptions) | Subscription sign-ups attributed to ads across Meta, Google, and TikTok |

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

***

## Example

A subscription brand spent **\$4,500** across all ad platforms and acquired **150 subscriptions**:

| Metric                    | Value       |
| ------------------------- | ----------- |
| Total Spend               | \$4,500     |
| Subscriptions             | 150         |
| **Cost per Subscription** | **\$30.00** |

***

## How It Works

This metric divides your total advertising spend across Meta, Google, and TikTok by the number of subscription sign-ups attributed to those ads. Lower values indicate more efficient subscriber acquisition. Data syncs daily from each platform's reporting API.

***

## When to Use

| Scenario                       | Action                                                 |
| ------------------------------ | ------------------------------------------------------ |
| Setting acquisition targets    | Establish benchmark cost per new subscription          |
| Comparing platforms            | Identify which platforms acquire subscribers cheapest  |
| Budget allocation              | Shift spend toward lower-cost subscription channels    |
| Evaluating campaign efficiency | Compare cost per subscription across creative variants |

***

## Related Metrics

| Metric                                                                                                    | Relationship                          |
| --------------------------------------------------------------------------------------------------------- | ------------------------------------- |
| [Blended Spend](/reference/metrics/advertising/blended/blended-spend/blended-spend)                       | Numerator — total advertising cost    |
| [Blended Subscriptions](/reference/metrics/advertising/blended/blended-conversions/blended-subscriptions) | Denominator — subscription sign-ups   |
| [Blended CPA](/reference/metrics/advertising/blended/blended-efficiency/blended-cpa)                      | All-conversion cost efficiency metric |

[See all Blended Conversions metrics →](/reference/metrics/advertising/blended/blended-conversions)