Arctan Calculator

Online arctan(x) calculator. Inverse tangent calculator.

• Arctangent calculator
• Arctangent definition
• Arctangent table
• Arctan on calculator

Arctangent calculator

In order to calculate arctan(x) with the online calculator:

1. Enter the input value.
2. Select result type of degrees (º) or radians (rad) in the right combo box.
3. Press the  =  button to calculate the result.

	arctan						ºrad

Arctangent definition

The arctangent function is the inverse function of y = tan(x).

arctan(y) = tan^-1(y) = x + kπ

For every

k = {...,-2,-1,0,1,2,...}

 

For example, If the tangent of 45º is 1:

tan(45º) = 1

Then the arctangent of 1 is 45º:

arctan(1) = tan^-1(1) = 45º

Arctangent table

y	x = arctan(y)
	degrees	radians
not defined	-90º	-π/2
-1.732050808	-60º	-π/3
-1.000000000	-45º	-π/4
-0.577350269	-30º	-π/6
0	0º	0
0.577350269	30º	π/6
1.000000000	45º	π/4
1.732050808	60º	π/3
not defined	90º	π/2

Arctan on calculator

In order to calculate arctan(y) on a calculator:

1. Press shift+tan buttons.
2. Enter the angle.
3. Press the = button.

Tangent calculator ►

 

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See also

• Tangent calculator
• Sine calculator
• Cosine calculator
• Arcsin calculator
• Arccos calculator