Enter any number into the inverse tan calculator. The calculator will return the inverse tangent of that number as degrees, radians, or gradians.

Arc Tan Calculator

Arctan(x) Atan2(y, x) Slope → Angle Two Points → Angle

Inverse Tan Formula

The following formula is used to calculate the inverse tangent of a value.

C=\arctan(x)
\tan(C)=x
  • Where C is the angle
  • x is the tangent value (for a right triangle, x = opposite/adjacent)

To calculate an angle using the inverse tangent, first compute the tangent value (for example, opposite/adjacent in a right triangle), then take the inverse tangent (arctan) of that value.

What is the inverse tangent?

Inverse tangent, also called arctangent (arctan), is the inverse of the tangent function on its principal branch. Since the tangent function takes an angle and returns a ratio, the inverse tangent takes a ratio (a real number x) and returns an angle C such that tan(C) = x (typically with C in the range −π/2 to π/2).

How to calculate inverse tangent?

How to calculate inverse tangent?

  1. First, determine the value.

    Determine the value you are taking the inverse tangent of (often a tangent ratio such as opposite/adjacent).

  2. Next, take the inverse tangent.

    Take the inverse tangent (arctan) to determine the angle that corresponds to the value from step 1.

FAQ

How can inverse tan be used?

The inverse tangent formula can be used to calculate the angle in a triangle when the tangent value (opposite/adjacent) is known.

What is arctan?

Arctan is just another name for inverse tan. The operation is the same.