Online Calculators & Tools




Arctan Calculator or converter

Online arctan(x) calculator. Inverse tangent calculator and formulas.



arctan
Angle in degrees:
°
Angle in radians:
rad
Calculation:



Arctangent definition


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


arctan(y) = tan-1(y) = x+


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
0.577350269 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+tab buttons.
  2. Enter the angle.
  3. Press the = button.