> For the complete documentation index, see [llms.txt](https://docs.whaly.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.whaly.io/data-management/explorations/metrics/create-a-calculated-metric.md).

# Create a Calculated Metric

A calculated metric is a metric that is based on other metrics, numbers and operators. When creating a calculated metric, you are presented with a formula editor. For example, let's say that we want to create a metric which is the percentage of gift card payment on a website. We already have two metrics : the total payment on our website and the payments with gift card on our website. Then, our calculated metric would look like the following : 

<figure><img src="/files/ZtWhKXDHoUmsmF1pmCOv" alt=""><figcaption></figcaption></figure>

### Format your metric

The next step will ask you to select a format for your metric. You can set a custom prefix or suffit (useful for currency, weight, ...), or you can take things a step further by [using the custom format](/data-management/explorations/metrics/using-custom-formatting.md) feature.

### Add drill down

You can also add a way for your user to explore further than the chart by adding drill down on your metric, please check the following section:

{% content-ref url="/pages/jb6gmVpMxMv9VHDyOZ9r" %}
[Create Drill Downs](/data-management/explorations/metrics/create-drill-downs.md)
{% endcontent-ref %}


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