> ## 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.

# Subscription Upgraded Cost: Ad Spend per Upgrade

> Calculate advertising cost per plan upgrade. Measure efficiency of upsell campaigns.

<Tip>
  Subscription Upgraded Cost measures how much you spend on advertising for each plan upgrade.
</Tip>

## Formula

<Info>
  **Subscription Upgraded Cost** = **Ad Spend** ÷ **Subscription Upgraded**
</Info>

### Formula Components

| Metric                                                                                   | Definition                                         |
| ---------------------------------------------------------------------------------------- | -------------------------------------------------- |
| [**Ad Spend**](/reference/metrics/advertising/blended/blended-spend)                     | Total advertising cost from connected ad platforms |
| [**Subscription Upgraded**](/reference/metrics/funnel/conversions/subscription-upgraded) | Count of plan upgrades                             |

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

***

## Example

You spent **\$2,000** on upsell campaigns in January and drove **78 upgrades**.

| Metric                     | Value   | Notes                |
| -------------------------- | ------- | -------------------- |
| Ad Spend                   | \$2,000 | Upsell campaign cost |
| Subscription Upgraded      | 78      | Plan upgrades        |
| Subscription Upgraded Cost | \$25.64 | Cost per upgrade     |

***

## How It Works

This metric divides your total ad spend by the number of upgrades to calculate your cost per expansion. Since upgrades typically have higher LTV, the acceptable CPA is often higher than initial acquisition.

***

## When to Use

| Scenario           | Action                                    |
| ------------------ | ----------------------------------------- |
| Upsell efficiency  | Measure upgrade campaign performance      |
| Budget allocation  | Compare upgrade cost to expansion revenue |
| Channel comparison | Identify most efficient upsell sources    |
| ROI analysis       | Calculate return on expansion campaigns   |

***

## Related Metrics

| Metric                                                                                           | Relationship                        |
| ------------------------------------------------------------------------------------------------ | ----------------------------------- |
| [Subscription Upgraded](/reference/metrics/funnel/conversions/subscription-upgraded)             | The denominator in this calculation |
| [Subscription Upgraded Value](/reference/metrics/funnel/conversions/subscription-upgraded-value) | Revenue from upgrades               |
| [Subscription Created Cost](/reference/metrics/funnel/conversions/subscription-created-cost)     | Cost for initial acquisition        |

[See all Conversions metrics →](/reference/metrics/funnel/conversions)