# Formulas & Rollups

## Lists

You can choose to show formula and rollup properties in Lists like List (*View Items) screen, List (Update Items) screen, List Component, Page Selector Component, etc.* 

However, you need to be aware of a limitation:

{% hint style="warning" %}
When you choose a property to view in the lists that is a rollup or formula dependent on a rollup, and if the formula is calculated over more than 25 related pages, Notion provides ***NotionApps*** results based on only the top 25 related pages.

*For example,* 

Let's say there are two databases: 

* `Projects` and `Tasks`. 
* `Projects` has a relation to `Tasks.`
* `Projects` has a rollup property that counts the number of `tasks` linked to a `project`.  

**Incomplete Data**

If a `project`is linked to 30 `tasks (> 25),`NotionApps will only receive the property value as 25 (`incomplete value`).

**Complete Data**

If a `project` is linked to `10 tasks`, NotionApps will receive `10 (correct value)`.
{% endhint %}

## Components

Rollups & Formulas can be shown in all components. 

{% hint style="success" %}
However, for properties where there might be incomplete data`(> 25 related pages)`, we suggest showing them in the Details (*View One Item)* or Form (*Update One Item)* screens. 

On these screens, when using a "View Text" component to view the property, you will see a refresh button next to it. 

On clicking the refresh button, we fetch the complete property data from Notion.
{% endhint %}

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We are working with Notion to make this experience better. Meanwhile, if you have questions, please reach out to us via our website chat or email us at <help@notionapps.com>.