ATAN function in Excel

What is the ATAN function in Excel?

The ATAN function is one of the math functions of Excel. It returns the arctangent of a number in radians, in the range Of -pi/2 to Pi/2.

We can find this function in the Math&trig section of the insert function Tab.

How to use ATAN function in excel

  1. Click on an empty cell (like F5 )
Click on empty cell

2. Click on the fx icon (or press shift+F3)

Click on the fx icon

3. In the insert function tab you will see all functions

 the insert function tab

4. Select math and trig category

5. Select the ATAN function

6. Then select ok

math and trig category

7. In the function arguments Tab you will see the ATAN function

8. In the Number section you can enter the tangent of the angle you want

9. You will see the result in the formula result section ( ATAN (0)=0)

Examples of ATAN function in excel

Example 1:

How to use ATAN function in excel

You can see examples of ATAN function below:

atan(-1) ----->>>>answer is  -0.785

atan(-0.5) ----->>>>answer is  -0.463

atan(0) ----->>>>answer is   0

atan(0.5) ----->>>>answer is  0.463

atan(1) ----->>>>answer is   0.785

math.atan(a)

How to plot Y=ATAN(X) with python code in excel

import math 

import numpy as np

import matplotlib.pyplot as plt

x =np.linspace(–2,+2, 100)

lenx=len(x)

y=[]

for i in range(lenx):     

y.append(math.atan(x[i]))     

i +=1    

plt.plot(x,y)  

plt.show() 

What is the purpose of ATAN function?

It returns the arctangent of a number in radians, in the range Of -pi/2 to Pi/2.

What is the Return value of ATAN function?

It returns a number.

How many arguments does ATAN function have?

This function has just 1 Argument.

The argument of ATAN function is number.

In the Number section you can enter the tangent of the angle you want

The argument of ATAN function is required and not optional.

ATAN(number) = number

Which version of excel supports ATAN function?

This function is available for all excel versions (2003-2019)

Errors in ATAN function

ATAN related functions :

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