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.


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.





Arcsine of -0.5 in radians, -pi/6



Arcsine of -0.5 in degrees



Arcsine of -0.5 in degrees


Applies To: Excel 2016, Excel 2010, Excel Starter, Excel 2013, Excel Online, Excel 2016 for Mac, Excel for Mac 2011, Excel 2007

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