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  • is any value and it is varying from -1 to 1.
    • ACOS() returns the arccosine of a number.


  • This function is the inverse function of COS in trigonometry.
  • The value of ACOS(Number) in radians in the range 0 to pi().
  • Calci returns the value of arccosine (inverse cosine) in Radians.
  • The number can be a single value or any number of values.

For example, ACOS(0.5,(-0.2),1) gives the arcCOS or inverseCOS values for each element.

  • Consider     x = 0.8    then     =ACOS(0.8)    gives    0.64350110879
  • Also it is called as Cyclometric function.
  • ACOS is described as arcCOS of a given number and denoted by .
  • In ACOS(x), x value should be between -1 & 1.
  • To find the angle in degrees, multiply the result angle with 180/PI(), or use DEGREES function.

For example ACOS(0.5)*180/PI() or DEGREES(ACOS(0.5)) gives 60



  • x   is the number
ACOS(number) Angle(radians)
ACOS(0) 1.57079632
ACOS(1) 0

Related Videos

Inverse Cosine

See Also