Online arctan(x) calculator. Inverse tangent calculator and formulas.

The arctangent function is the inverse function of y = tan(x).

**arctan( y) = tan^{-1}(y) = x+ kπ**

For every

*k* = {...,-2,-1,0,1,2,...}

For example, If the tangent of 45° is 1:

**tan(45°) = 1**

Then the arctangent of 1 is 45°:

**arctan(1) = tan ^{-1}(1) = 45°**

y | x = arctan(y) | |
---|---|---|

degrees | radians | |

-1.732050808 | -60° | -π/3 |

-1 | -45° | -π/4 |

-0.577350269 | -30° | -π/6 |

0 | 0° | 0 |

0.577350269 | 30° | π/6 |

1 | 45° | π/4 |

1.732050808 | 60° | π/3 |

In order to calculate arctan(y) on a calculator:

- Press shift+tab buttons.
- Enter the angle.
- Press the = button.

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