> For the complete documentation index, see [llms.txt](https://docs.exploratory.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.exploratory.io/data-wrangling/mutate.md).

# Create New Calculation

Mutate creates new column(s) with given expressions and preserves existing column(s). To override existing column, you can select existing column on Mutate Dialog.

## How to Access This Feature

### From + (plus) Button

![](/files/-M4oNAk1ZVhgO7_4jafO)

* Click "+" button and select "Mutate (Create Calculation)".

### From Column Menu

![](/files/-M4oNAk57RI1iNGjqfhq)

* You can also select "Create Calculation (Mutate)" from column menu of the column which becomes the basis of the new calculation.

## Create New Column with New Calculation

![](/files/-M4oNAk8O27VoNIc7Hjl)

1. Click the "Create New Column" radio button.
2. Type in the name of new column in "New Column Name" field.
3. Type in the R Calculation in "Calculation" field.
4. Click "Run" to run the calculation and create the new column.

## Overwrite Existing Column with New Calculation

![](/files/-M4oNAkB6GlLxpKYRquQ)

1. Click the "Overwrite Existing Column" radio button.
2. Select the column to overwrite with the new calculation from "Column" list.
3. Type in the R Calculation in "Calculation" field.
4. Click "Run" to run the calculation and overwrite the values of the column.