Tangent Calculator for Degrees or Radians

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On this page is a tangent calculator, for either angles or degrees. Enter the angle's measurement, choose your units, and run the calculator to see the tangent.

Tangent Calculator for Angles or Radians

Using the Tangent Calculator

To use the tool to find the tangent, enter the measurement of the angle in either degrees or radians, choose the units, and compute.

  • Angle - measurement of your angle (in degrees or radians)
  • Degrees or Radians? - choose the units in the menu

Once you're happy with the inputs, click the "Compute Tangent" button.

  • Tangent - the tangent, or ratio of the opposite side over the adjacent side's measurement

What is the tangent?

For a given angle in a right triangle, tangent is the ratio of the opposite side to the adjacent side.

Right triangle to illustrate trigonometry functions
Right Triangle Diagram (CC By-SA 3.0 Wikimedia)

Trigonometric functions can also be used to find the ratio between sides of a unit circle (a circle with radius 1).

Unit Circle to illustrate trigonometry.
Unit circle diagram (CC By-SA 3.0 Wikimedia)

Tangent as a formula

As a trigonometry formula, tangent is usually abbreviated as "tan", as in the following equation:


If you already know the tangent, use the inverse tangent or the arctangent to find the angle.

After, find all the trigonometric functions and inverse trigonometric functions in one tool.



PK started DQYDJ in 2009 to research and discuss finance and investing and help answer financial questions. He's expanded DQYDJ to build visualizations, calculators, and interactive tools.

PK lives in New Hampshire with his wife, kids, and dog.

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