Arctan - Inverse Tangent Calculator

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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 ►

See also

  • Arctan function
  • Tangent calculator
  • Sine calculator
  • Cosine calculator
  • Arcsin calculator
  • Arccos calculator
  • Trigonometry calculator

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