# Formula Editor

Learn how you can apply built-in formulas on the spreadsheet cells with the Formula Editor of Spread Designer.

## Content

In the **Formula** bar, when you type an equals sign, (“=”) then the drop-down list displays all the built-in functions for you to choose from. Or if you click on the **Choose Formula** button on the **Formula** bar, the **Formula Editor** is displayed. The **Formula Editor** allows you to select any of the built-in functions.
![Spread Designer Formula Editor](https://cdn.mescius.io/document-site-files/images/346c9178-0ed8-4fb9-908b-1565b22fb408/artwork/sd-editor-formula-empty.png)
The **Formula Editor** gives you a list of the built-in functions that you can use and displays a brief description and syntax of the selected function. To choose a function, double-click on the function name and it appears in the Formula field. You may also type operators and constants to construct your formula.
For more information on formulas, refer to [Managing Formulas](/spreadnet/docs/latest/online-asp/overview/spweb-devguide/spweb-formulas) and to the [Formula Reference](https://developer.mescius.com/spreadnet/docs/latest/online-formula/overview.html).