ASIN function

This article describes the formula syntax and usage of the ASIN function in Microsoft Excel.

Description

Returns the arcsine, or inverse sine, of a number. The arcsine is the angle whose sine is number. The returned angle is given in radians in the range -pi/2 to pi/2.

Syntax

ASIN(number)

The ASIN function syntax has the following arguments:

• Number    Required. The sine of the angle you want and must be from -1 to 1.

Remark

To express the arcsine in degrees, multiply the result by 180/PI( ) or use the DEGREES function.

Example

Copy the example data in the following table, and paste it in cell A1 of a new Excel worksheet. For formulas to show results, select them, press F2, and then press Enter. If you need to, you can adjust the column widths to see all the data.

Formula	Description	Result
=ASIN(-0.5)	Arcsine of -0.5 in radians, -pi/6	-0.523598776
=ASIN(-0.5)*180/PI()	Arcsine of -0.5 in degrees	-30
=DEGREES(ASIN(-0.5))	Arcsine of -0.5 in degrees	-30