---
url: /set-instructions/apply-header-sizing-using-formula.md
description: >-
  Sets the header width or height on elements in the working set based on a
  formula
---

# Apply Header Sizing Using Formula

Sets the column width or row height for each element in the working list, computed per element by a formula - column width if the set is on a column axis, row height if it's on a row axis.

::: warning Must evaluate to a number
The formula has to return a plain number - `200`, not `"200"` or `"200px"`. A quoted string or a value with a unit suffix isn't applied.
:::

| Argument | Type | Description |
| --- | --- | ------ |
| Formula | Formula | The formula to evaluate for each element in the working set |

#### Example

```
IF(ELEMENT("Account") = "Description", 300, 120)
```

On a column set, this widens the `Description` column to `300` pixels while leaving every other column at `120`; on a row set, the same formula sets the `Description` row's height to `300` instead - useful when one or two elements need more room than the rest without manually resizing each one.

![Apply Header Sizing Using Formula sets column width on a column axis and row height on a row axis; a string result like "300px" is ignored either way](/set-instructions-example-header-sizing.svg)