Calculated fields allow you to create new data from data that already exists in your data source. When you create a calculated field, you are essentially creating a new field (or column) in your data source, the values or members of which are determined by a calculation that you control.

Why are calculated fields important?

Calculated fields play an important role in data visualization in tableau. These are fields that we create that don't already exist in your data source. These calculated fields are created using formulas that are often based on other fields.

What does a calculated field do?

A calculated field is a field that uses existing database fields and applies additional logic — it allows you to create new data from your existing data. ... performs some calculation on database fields to create a value that is not directly stored in the database or.