---
title: Example: Calculate a cumulative sum
slug: analytics/docs/example-calculate-a-cumulative-sum
docTags: 
createdAt: 2026-07-20T15:44:54.995Z
---

You can create cumulative sums in Universal Explorations in Analytics. For example, the following steps walk through creating a cumulative sum of **make purchase** events in the last 30 days:

1. Click **+** > **Universal exploration**.
2. Choose the **Event aggregate** block.
3. Select the **Count of events** measure and the **Make purchase** event from the drop-down list. When you run this exploration, it displays the number of purchase events in the last 30 days.
4. Expand the block shelf, click **+ >** **Moving aggregation**.
5. Select **Cumulative** as the aggregation type from the drop-down list and **sum** as the aggregator.
6. Select the event aggregate block you created earlier as the value and click **Apply** to reference it.
7. Click **+** > **Metric** and select the cumulative sum block as the value.
8. Set the time range to **30 days** and run the exploration. The daily count and cumulative sum of **Make purchase** events are displayed.