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A to Z of Excel Functions: The CSC Function

23 February 2018

Welcome back to our regular A to Z of Excel Functions blog. Today we look at the CSC function.

The CSC function

This function returns the cosecant of an angle specified in radians:

It has the following chart properties:

The CSC function employs the following syntax to operate:


The CSC function has the following arguments:

  • number: this is required.

It should be further noted that:

  • the absolute value of number must be less than 2^27
  • if number is outside its constraints, CSC returns the #NUM! error value
  • if number is a non-numeric value, CSC returns the #VALUE! error value
  • CSC(n) equals 1/SIN(n).

Please see my example below: 

We’ll continue our A to Z of Excel Functions soon. Keep checking back – there’s a new blog post every business day.