On this page is an *inverse sine calculator* (or *arcsin calculator*), which calculates an angle from the ratio from the sine function. Enter your result and choose if you want the tool to return radians or degrees, then compute the angle.

## Inverse Sine Calculator

**Table of Contents**show ▼

## Using the Arcsine Calculator

To use the tool to find the angle from a sine, enter the ratio, choose the units you'd like as output, and compute.

**Sine**- ratio of the opposite side to the hypotenuse**Output Degrees or Radians?**- choose whether you'd like the tool to return degrees or radians

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

**Angle**- the angle you'd input if you wanted to get the sine you entered

## What is the arcsine or inverse sine?

Arcsine is the inverse of the sine, which is the ratio of the opposite side to the hypotenuse (longest side) in a right triangle.

As the opposite side of the angle in question can never be larger than the hypotenuse – it can only match the length – arcsine can only be between -1 and 1.

### Arcsine as a formula

Inverse sine is usually abbreviated as "arcsin" or "asin", as in the following equation:

arcsin(y)=asin(y)

Where it is the inverse of sine, or:

x=arcsin(y)\\y=sin(x)

*Next, see all the inverse trigonometric functions* or

*trigonometric functions in one tool.*