Returns the arccosine of a number.
Syntax
ACOS(number)Argument
numberobligatoriskt
The cosine of the angle you want, a value between -1 and 1.
The ACOS function calculates the angle whose cosine is the specified number. The returned angle is given in radians in the range 0 to pi.
=ACOS(0.5)→1.047197551Returns the arccosine of 0.5 in radians, which is pi/3.
=ACOS(-1)→3.141592654Returns the arccosine of -1, which is equal to pi.
Select a cell
Click on the cell where you want to display the result.
Enter the formula
Type =ACOS(number) and replace 'number' with a value between -1 and 1.
Convert to degrees (optional)
Wrap the function in the DEGREES function to convert the result from radians to degrees.
Excel will return the #NUM! error because the cosine of an angle cannot be outside this range.
You can use the formula =DEGREES(ACOS(number)).