Excel TAN Function

Summary

The Excel TAN function returns the tangent of angle given in radians. To supply an angle to TAN in degrees, multiply the angle by PI()/180 or use the RADIANS function to convert to radians.

Purpose

Get the tangent of an angle

Return value

The tangent value.

Syntax

=TAN (number)

Arguments

number - The angle in radians for which you want the tangent.

Usage notes

The TAN function expects radians. To supply an angle to TAN in degrees, multiply the angle by PI()/180 or use the RADIANS function to convert to radians. For example, to get the TAN of 60 degrees, you can use either formula below:

=TAN(45*PI()/180)=TAN(RADIANS(45))