Arctan Calculator

Online arctan(x) calculator. Inverse tangent calculator.

arctan

Calculate Reset

Angle in degrees:

°

Angle in radians:

rad

Calculation:

Tangent calculator ►

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 45° is 1:

tan(45°) = 1

Then the arctangent of 1 is 45°:

arctan(1) = tan^-1(1) = 45°

Arctangent table

y	x = arctan(y)
	degrees	radians
-1.732050808	-60°	-π/3
-1	-45°	-π/4
-0.577350269	-30°	-π/6
0	0°	0
0.577350269	30°	π/6
1	45°	π/4
1.732050808	60°	π/3

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
• Trigonometry calculator