Arctan Calculator

Find the angle whose tangent equals a given value.

Calculate

Enter your values below.

Result

Angle
0

Formula used

arctan(x), defined for any real x

Example: arctan(1) = 45°.

How to use this calculator

  1. Enter Value.
  2. Choose Output unit.
  3. Press Calculate to see your result instantly.

FAQ

Frequently asked questions

Does arctan accept any value?

Yes, unlike arcsin and arccos, arctan is defined for all real numbers.

What is the range of arctan's output?

Between -90° and 90° (or -π/2 to π/2 radians).

What is arctan(0)?

0°.

Where is arctan commonly used?

Finding an angle from a slope or ratio of opposite to adjacent sides in a right triangle.