Returns a positive square root.
Syntax
SQRT(number)
Number is the number for which you want the square root.
Remark
If number is negative, SQRT returns the #NUM! error value.
Example
The example may be easier to understand if you copy it to a blank worksheet.
How to copy an example
 Create a blank workbook or worksheet.
 Select the example in the Help topic.
Note Do not select the row or column headers.
Selecting an example from Help
 Press CTRL+C.
 In the worksheet, select cell A1, and press CTRL+V.
 To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.

A 
Data 
16 
Formula 
Description (Result) 
=SQRT(16) 
Square root of 16 (4) 
=SQRT(A2) 
Square root of the number above. Because the number is negative, an error is returned (#NUM!) 
=SQRT(ABS(A2)) 
Square root of the absolute value of the number above (4) 
