# Retention chart

Retention chart are a great way to visualize cohorts

<figure><img src="https://34758050-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MC1g4I2_CgXd0qAq1P7%2Fuploads%2F5Pq9jicOr2DLUo4R8XK8%2Fimage.png?alt=media&#x26;token=8644019d-e6aa-4de3-a4e6-92122b584547" alt=""><figcaption></figcaption></figure>

### **Chart usage**

You must select two metrics to use the retention chart :&#x20;

* The first metric is the cohort value, for example the retained users
* The second metric is the cohort size, for example the total number of users in a cohort

You should also select two dimensions  to use the retention chart :&#x20;

* The first dimension is the cohort label, this will be placed vertically
* The second dimension is the step in the cohort, the will be placed as a column

In order to have ordered dimensions you should provide alphabetically ordereable dimension values, for example : &#x20;

Cohort labels:

```
2024-01, 2024-02, 2024-03, 2024-04, ...
```

Cohort steps:

```
Month 00, Month 01, Month 02, Month 03, ...
```

### **Chart characteristics**

* Number of metrics : 2
* Number of dimensions : 2