ATAN Function in Excel: Syntax, Examples and Free Practice

By Rinkesh Shah, founder of Cellgrids.

ATAN is an Excel Math & Trig function. Returns the arctangent of a number, in radians.

ATAN syntax

=ATAN(number)

ATAN is used in financial models and engineering-style calculations where precise numeric work is needed.

Open the live Excel-style spreadsheet and try ATAN yourself. No Excel install or sign-up needed to start.

What does the ATAN function do in Excel?

Returns the arctangent of a number, in radians.

What is the syntax of ATAN in Excel?

The syntax is =ATAN(number). number: A number to use in the calculation.

Where can I practice ATAN online for free?

Open the free live spreadsheet on Cellgrids and try ATAN yourself. No Excel install is needed and you can start without signing up.