## SUM function: Description, Usage, Syntax, Examples and Explanation

What is SUM function in Excel? SUM function is one of Math and Trig functions in Microsoft Office Excel that adds all numbers in a range of cells and returns the result. Syntax of SUM function The syntax for the SUM function in Microsoft Excel is: SUM( number1, [number2, … number_n] ) OR SUM ( cell1:cell2, [cell3:cell4], …