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Excel COS function

Author: Sun Last Modified: 2019-06-21

doc cos function 1


The COS function returns the cosine of an angle given in radians.

Syntax and arguments

Formula syntax



  • Number: Required. The angle in radians whose cosine value you want to calculate.

Return Value

The ABS function returns a cosine value (numeric value).


1. The (number) argument is the angle in radians.

2. if the (number) argument is the angle in degree, either multiple the PI()/180 or use the RADIANS function to convert the angle to radians. I.e. Calculate the cosine value of degree 60, use this formula =COS(RADIANS(60)) or =COS(60*PI()/180).

Usage and Examples

Here list the basic usages of COS function in your daily work.

Example 1- Calculate the cosine value of a given angle in radians

Formula syntax:



Angle_radians: the angle in radians you want to calculate its cosine value.

Supposing the given angle of radian is 1.245, you can use this formula

doc cos function 2

Example 2- Calculate the cosine value of a given angle in degrees

Formula syntax:

=COS(angle_degrees *PI()/180)


Angle_degrees: the angle in degrees that you want to calculate its cosine value.

Supposing the given angle in degrees is 30, you can use this formula

doc cos function 3

Or you can use the formula

doc cos function 4

Download Sample File
doc sample file

Relative Functions

  • Excel ASIN Function
    The ASIN function calculates the arcsine of a give number, and returns an angle which is in radians between -π/2 and π/2.

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