Tan Inverse Calculator

Your details

Choose how to enter the input: as a single tangent ratio, as the two legs of a right triangle, or as the atan2 two-argument form that handles all four quadrants.
Any real number. arctan(1) = 45°.
Number of decimal places shown in the degree and radian results.
Angle in degrees
45°

The angle whose tangent equals the input, in the range -90° to 90° (or -180° to 180° for atan2).

Angle in radians0.7854rad
Angle in gradians50grad
As a pi fractionπ/4
Effective tan ratio1
45 °
Negative steep<-45Negative-45-0Positive0-45Positive steep45+

arctan(1.0000) = 45.0000°

  • The angle is 45.0000° or π/4 radians (0.7854 rad).
  • 45° is a landmark angle: opposite = adjacent, forming an isosceles right triangle.

Next stepTo verify: compute tan(45.0000°) and you should get back approximately 1.0000.

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