The Excel IMSUM function returns the sum of two or more complex numbers. The complex numbers must be in the form x + yi or x + yj. Use the COMPLEX function to create a complex number from real and imaginary parts.


Get sum of complex numbers

Return value 

Sum of complex numbers as text


  • inumber1 - Complex number 1.
  • inumber2 - [optional] Complex number 2.

How to use 

Use the Excel IMSUM function to get the sum of two or more complex numbers in the form x + yi or x + yj. For example:

=IMSUM("1+2i",3) // returns "4+2i"
=IMSUM("3+4i","1+2i") // returns "4+6i"

In the example shown, the formula in D6, copied down, is:

Dave Bruns Profile Picture

AuthorMicrosoft Most Valuable Professional Award

Dave Bruns

Hi - I'm Dave Bruns, and I run Exceljet with my wife, Lisa. Our goal is to help you work faster in Excel. We create short videos, and clear examples of formulas, functions, pivot tables, conditional formatting, and charts.