# header_getSize

# Function: header\_getSize()

```ts
function header_getSize<TFeatures, TData, TValue>(header): number;
```

Defined in: [features/column-sizing/columnSizingFeature.utils.ts:98](https://github.com/TanStack/table/blob/main/packages/table-core/src/features/column-sizing/columnSizingFeature.utils.ts#L98)

## Type Parameters

### TFeatures

`TFeatures` *extends* [`TableFeatures`](../interfaces/TableFeatures.md)

### TData

`TData` *extends* [`RowData`](../type-aliases/RowData.md)

### TValue

`TValue` *extends* `unknown` = `unknown`

## Parameters

### header

[`Header`](../type-aliases/Header.md)\<`TFeatures`, `TData`, `TValue`\>

## Returns

`number`