ACOT function

This article describes the formula syntax and usage of the ACOT function (function: A prewritten formula that takes a value or values, performs an operation, and returns a value or values. Use functions to simplify and shorten formulas on a worksheet, especially those that perform lengthy or complex calculations.) in Microsoft Excel.


Returns the principal value of the arccotangent, or inverse cotangent, of a number.



The ACOT function syntax has the following arguments.

  • Number    Required. Number is the cotangent of the angle you want. This must be a real number.


  • The returned angle is given in radians in the range 0 (zero) to pi.
  • If Number is a non-numeric value, ACOT returns the #VALUE! error value.
  • Use the DEGREES function or multiply by 180/PI() to convert the result from radians to degrees.


The workbook below shows examples of this function. Inspect them, change existing formulas, or enter your own formulas to learn how the function works.

To work more in-depth with the example data in Excel, download the embedded workbook to your computer, and then open it in Excel.

Top of Page Top of Page

Applies to:
Excel 2013, Excel Online