On this page is a *sine calculator*, which works for your input of either angles or degrees. Enter your angle measurement and choose the units and run the calculator to see the sine.

## Sine Calculator for Angles or Radians

**Table of Contents**show ▼

## Using the Sine Calculator

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

**Angle**- measurement of the angle (in either degrees or radians)**Degrees or Radians?**- use the menu to choose the units

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

**Sine**- the sine, or ratio of the opposite side over the hypotenuse

## What is the sine?

For a given angle in a right triangle, sine is the ratio of the opposite side to the hypotenuse (longest side).

As the hypotenuse is the longest side, the longest the opposite side can be is *equal* to the hypotenuse. It follows that sine is always less than or equal to 1.

More generally, trigonometric functions can be used to find the ratio between sides of a unit circle, or a circle with radius 1.

### Sine as a formula

As a trigonometry formula, sine is usually abbreviated as "sin", as in the following equation:

\sin(\theta)

If you know the result of the sine function, you can use arcsin or the inverse sine to find the angle.

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