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Tangent Angle Calculator

Created by Joanna Śmietańska, PhD
Reviewed by Steven Wooding
Last updated: Jan 18, 2024

This quick tangent angle calculator will help you whenever you wonder how to find the tangent angle. It doesn't matter if the angle in your homework is given in degrees, radians, or pi radians. Read below to find out more helpful information about the tangent of an angle.

How to find tangent angle?

In trigonometry or geometry, the tangent of an angle (simply denoted as tan) is the length of the side opposite the angle divided by the adjacent side. Note that this only applies to a right-angle triangle. Sounds complicated? Don't worry. Let's look at the image to help explain:

Right angle triangle

If α\alpha is the angle between bb and cc sides of the triangle, then the tangent of an angle tan(θ)\tan(\theta) is the ratio between opposite side aa and adjacent side bb.

tan(θ)=ab\small{\tan(\theta) = \frac{a}{b}}

Another definition states that tangent is the ratio of the sine function and cosine function, so tangent is the sin/cos ratio.

Properties of tangent function

The tangent function is one of the main trigonometric functions. The graph of the tangent function has the peculiarity that it has no definite value at x = -π/2, π/2, -3π/2, 3π/2, 5π/2, etc. (or -90°, 90°, -270°, 270°, 450°, etc.).

plot of tan(x) in <-2π,2π> range

Unlike the sine or cosine, the tangent function has a period of π\pi, so its values repeat after every π radian.

💡 Test it yourself! Try entering the angle π/2 (or 90° in degrees) into this tangent angle calculator and see what value it gives you.

Example of how to calculate tangent of an angle

If you want to find the tangent of a given angle, enter the degree into our tangent angle calculator or follow these steps:

  1. Identify the hypotenuse in your triangle. Usually, it is the longest side of the triangle.

  2. Measure the two sides between which there is an angle and denote them as aa (opposite) and bb (adjacent), for example, a=21a = 21 and b=8b = 8.

  3. Divide aa by bba/b=21/8a/b = 21/8=2.63 = 2.63. You will get a tangent of an angle.

Other useful trigonometry calculators

Once you know how to use the tangent of angle calculator, check out our other trigonometric tools:


Is tangent x/y?

No, the tangent of an angle is y/x. You may see the triangles, where r is the hypotenuse, x is the adjacent side at the angle, and y is the opposite side. But the tangent of an angle is the ratio of the opposite/adjacent sides, which in this case is y/x.

What is the tangent of pi/4?

1. You can express the pi/4 in radians as 45° in degrees, and tan(45°) = 1. As the angle pi/4 lies between 0 and pi/2, the tangent function is positive and equal to 1.

Joanna Śmietańska, PhD
Trigonometric function: Tangent
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