> ## Documentation Index
> Fetch the complete documentation index at: https://docs.optimazehq.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Feature cost per subscription tier

> Spread the full cost of a feature over each subscription tier with one unit economic per tier.

This answers "what does this feature cost me, spread over the subscribers in each tier?" You create one unit economic per tier. Every one uses the same cost, the feature's total, and divides it by that tier's subscriber count.

| Unit economic | Cost from | Divide by |
| :- | :- | :- |
| *Search cost per Pro subscriber* | *Search* | Pro subscribers |
| *Search cost per Enterprise subscriber* | *Search* | Enterprise subscribers |

**Time**: 10 minutes per tier.

> [!NOTE]
>
> Each tier carries the whole cost of the feature, so the figures do not add up to the feature cost and are not a split of it. Read each one as the feature cost per subscriber if that tier alone paid for it, and compare it with the tier's price.

## Before you start

* A node for the feature. See [Cost per feature](https://docs.optimazehq.com/guides/cost-per-feature.md).
* A subscriber count for each tier, as one metric per tier, for example `active_subscriptions_pro` and `active_subscriptions_enterprise`. The **Active Subscriptions by Tier** template is a good starting point. See [Business metrics](https://docs.optimazehq.com/business-metrics.md).

## Create a unit economic for each tier

Under **Measure**, select **Unit Economics**, then **New unit economic**. Repeat for each tier:

* **Name**: *Search cost per Pro subscriber*
* **Cost from**: the model and the feature node, the same node for every tier
* **Divide by**: **Published metric**, then that tier's subscriber count
* **More details**: set **Currency** and a **Unit Display Name** of *per Pro subscriber*

Check the **Preview** shows a value, then select **Create**.

## Read the result

* Compare the tiers side by side on the **Unit Economics** page, or put them on a [dashboard](https://docs.optimazehq.com/dashboards.md).
* Set a [goal](https://docs.optimazehq.com/goals.md) on each, for example keeping the cost of Search per Pro subscriber below a share of the Pro price.
* Because the cost is the same in every unit economic, differences between tiers come only from subscriber numbers. A rising figure for one tier means that tier is shrinking or the feature is getting more expensive. Check the feature's cost trend to tell which.

## Check your numbers

* Each tier's subscriber count must cover the same period as the cost, or the **Preview** shows no value.
* For a single figure across every tier, create one more unit economic with the same cost divided by total subscribers.


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