> ## Documentation Index
> Fetch the complete documentation index at: https://docs.askgrapple.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Formula

> Calculate a new field with a spreadsheet formula

Use `/formula` to add a calculated column using a row-level expression.

## How to use

1. Type `/formula` and press **Space**.
2. Describe the calculation — for example, *"full name from first and last name"* or *"days since created"*.
3. Grapple generates the formula and adds one new column.

Formulas operate on fields in the same row. Each change triggers materialization.

## Examples

* Concatenate two text fields
* Date math between columns
* Simple arithmetic on numeric fields