> ## Documentation Index
> Fetch the complete documentation index at: https://statsig-4b2ff144-serverless-cloudflare.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Custom Metrics

> Create custom metrics by filtering and aggregating events based on event metadata and properties.

# Custom Metrics

You can create **Custom Metrics** using the custom events you ingest by filtering or aggregating events based on event metadata. You must include metadata along with the custom events when you log these events with Statsig.
For example, in addition to tracking overall **event\_count** for all events of type *purchase\_event*, you may want to filter these metrics only for events where your users purchase a specific product category.

Statsig supports five types of custom metrics:

| Metric Type    | Description                                                                                                               | Examples                                                    |
| -------------- | ------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------- |
| Event Count    | **Total count of events** filtered by the *Value*, *Metadata*, or *User* properties of an event type                      | **Add to Cart** event filtered by category type             |
| User Count     | **Number of unique users** that trigger events filtered by the *Value*, *Metadata*, or *User* properties of an event type | **Active Users** based on their views of a product category |
| Aggregation    | **Sum or Average** of the *Value*, *Metadata*, or *User* property of an event type                                        | **Total Revenue**                                           |
| Ratio          | **Rates** (e.g. cart conversion rate, purchase rate), **Normalized Values** (e.g. sessions per user, items per cart)      | **Cart Conversion Rate**, **Sessions per User**             |
| Funnel         | **Funnels**- funnel of multiple events with conversion tracking                                                           | **Sign-up Funnel**, **Checkout Funnel**                     |
| Count Distinct | **Count Distinct**- Number of unique values for a given field, often approximated with sketches                           | **Unique Songs** listened per user                          |

<Warning>**Beta Feature**: Sketch-based count distinct metrics are in beta. Please reach out to learn more and join our beta testing!</Warning>

It's worth noting that the "average" in aggregation is the average of event value (average revenue per purchase per user), instead of the average of exposed units (average revenue per user). The latter is defined by sum.

See **Metrics 201** topic, [Creating Custom Metrics](/metrics/create), to learn how to create custom metrics for your product.