# formula

Formula string applied to this column. Review formula support and original-coordinate rules.

Canonical: https://grid.syidax.com/docs/columns/formula/

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## What does this API do?

Formula string applied to this column. Review formula support and original-coordinate rules.

API for Pro features: Built-in formulas, references, dependency recalculation and calculated columns

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## Exact input and result types

```typescript
formula?: string
```

| Item | Value |
| --- | --- |
| Required | Optional |
| Input type | string |

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## Usage flow

Set this on an individual column object in columnDefs. Pass arrays, objects, and callbacks through JavaScript, and use new arrays or objects when applying changes.

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## Feature explanations and examples

- [Formula calculation](https://grid.syidax.com/docs/features/formulas.md) — Formulas evaluate strings beginning with = and display the result in a cell. For example, =SUM(A1:A3) references the first column in the original column definitions and the first three source rows.