Inverse Tangent Calculator

Find the angle whose tan is x (tan⁻¹ or arctan) in degrees and radians, with the principal range explained.

Enter values

Result

Angle

45 °

Principal value range: −90° to 90°.

Find the angle whose tan is x (tan⁻¹ or arctan) in degrees and radians, with the principal range explained.

Also known as: arctan, tan^-1, inverse tan, atan calculator, arctangent calculator.

Enter value x.
The result updates instantly as you type — press Calculate (or Enter) at any time.
Review the breakdown shown under the main result.
Use Copy result or Share to save the answer or send a link with your inputs.

θ = tan⁻¹(x)

Using the values pre-filled in the calculator above:

the calculator returns: