Arctan Calculator
Compute the inverse tangent ($\arctan$) angle value instantly with our interactive real-time projection Unit Circle.
Enter Value
Angle Output
45.00°
What is the Arctan Calculator?
The Arctan (Inverse Tangent) Calculator is an inverse trigonometry tool. While regular Tangent turns an angle into a ratio, Arctan reverses the process—taking a numerical ratio and turning it back into a physical angle in degrees or radians.
How It Works (Formula)
If you know the lengths of the "Opposite" and "Adjacent" sides of a right triangle, you divide them to get a ratio "x". The Arctangent function calculates the specific angle $\theta$ that produces that exact ratio.
$$ \theta = \arctan(x) \iff \tan(\theta) = x $$
The inverse functional relationship between Tangent and Arctangent.
How to Use It
Input your numerical value (the tangent ratio). The calculator will instantly process the inverse function and output the corresponding angle in both Degrees and Radians.