# Using computed columns

Create computed columns to calculate values from other columns no matter datasource or extract data from JSON.

### Adding a computed column

In Data View you can add a computed column to a table by clicking on the + symbol at the right of your rightmost column.

### Calculating numbers

Let's make a simple calculation to illustrate how calculated columns can be used. We'll calculate total order value in this case. You're able to chain calculations and create multiple computed columns on top of each other.

### Extracting JSON data

If you have JSON data it is easy to visually extract parts of it by using computed columns.