ASIN function

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


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.



The ASIN function syntax has the following arguments:

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


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







Arcsine of -0.5 in radians, -pi/6



Arcsine of -0.5 in degrees



Arcsine of -0.5 in degrees


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