Arctan (Inverse Tangent) Calculator
Enter a value y to compute arctan(y) in degrees and radians.
This Arctan Calculator tool will let users input a value (y) and compute arctan(y) in both degrees and radians, plus show a reference table for common values.
Arctangent Definition
The arctangent function is the inverse of tangent:
$$y = \tan(x) \quad \Rightarrow \quad x = \arctan(y) $$
General solution:
$$\arctan(y) = \tan^{-1}(y) = x + k\pi, \quad k \in \mathbb{Z}$$
Example:
$$\tan(45^\circ) = 1 \quad \Rightarrow \quad \arctan(1) = 45^\circ$$