Arcsine Calculator

Use this calculator to easily calculate the arcsine of a number.

Calculation results

arcsin(0.5) = 30 degrees
arcsin(0.5) = 0.523599 radians
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Arcsine function

The arcsine is one of the inverse trigonometric functions (antitrigonometric functions) and is the inverse of the sine function. It is sometimes written as sin-1(x), but this notation should be avoided as it can be confused with an exponent notation (power of, raised to the power of). The arcsine used to obtain an angle from the sine trigonometric ratio, which is the ratio between the side opposite to the angle and the longest side of the triangle.

The function spans from -1 to 1, and so do the results from our arcsin calculator. The range of the angle values is usually between -90° and 90°. There are a number of arcsin rules, like that sin(arcsin(x)) = x, or that arcsinα + arcsinβ = arcsin(α√(1-β2) + β√(1-α2)), as well as cosine of the arcsine: cos(arcsin(x)) = sin(arccos(x)) = √(1-x2), which can help you in trigonometry calculus.

How to calculate the arcsine of a number?

The easiest way to calculate it is by using our arcsin calculator above, which will output results in both degrees and radians. Other ways include other given information, such as the values of other trigonometric functions for the same angle or other angles in the same triangle.

Here is a table of common arcsin values:

Common values of the arcsin function
xarcsin(x) (°)arcsin(x) (rad.)
-1 -90° -π/2
-√3 / 2 -60° -π/3
-√2 / 2 -45° -π/4
-1/2 -30° -π/6
0 0
1/2 30° π/6
√2 / 2 45° π/4
√3 / 2 60° π/3
1 90° π/2

π is, of course, the mathematical constant about equal to 3.14159.

Cite this calculator & page

If you'd like to cite this online calculator resource and information as provided on the page, you can use the following citation:
Georgiev G.Z., "Arcsin Calculator", [online] Available at: https://www.gigacalculator.com/calculators/arcsin-calculator.php URL [Accessed Date: 24 Mar, 2019].