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Introduction - Square Root in VBA
This VBA tutorial shows you how to take the square root of a number in VBA using the Sqr function. The VBA Sqr function accepts one argument - a positive number - and will return the square root of that number as a Double data type.
Let’s take a look at an example.
Example - Square Root in VBA
VBA Sqr Function
Sub VBA_Square_Root() Dim d1 As Double Dim d2 As Double d1 = 144 d2 = Sqr(d1) 'Returns 12 Debug.Print d2 End Sub
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Tutorial - Square Root in VBA
How to find the square root in VBA
The VBA Sqr function returns the square root of a number. The Sqr function accepts one argument: a positive number. Here’s the syntax for the Sqr function:
In the example above, the “Number” argument is 144 so the value of
Common Errors with the Sqr function
Like I said earlier, the Sqr function accepts a positive number. Any number multiplied by itself returns a positive number so, ignoring imaginary numbers, you can’t take the square root of a negative number.
Because of that, the VBA Sqr function will produce a “Run-time error ‘5’ Invalid procedure call or argument” error when attempting to take a square root of a negative number.
Similarly, you will get a “Run-time error ‘13’ Type Mismatch” error when you try to take the square root of something that isn’t a number.
With that said, the Sqr function isn’t dumb. If you try to take the square root of a string that represents a number, it will properly process the string as a number and return the square root. Here’s an example to demonstrate what I mean:
Sub VBA_Square_Root_String() Dim val1 As String Dim val2 As String val1 = "16" val2 = Sqr(val1) 'Returns "4" Debug.Print val2 End Sub
The result of applying the square root function in this example is a string with a value of “4.” If the variable
You’ll want to use the Sqr function anytime you need to calculate the square root in VBA.
It’s wise to use the Sgn function to test for a positive number or the Abs function to return the absolute value of your number before passing it as an argument to the VBA Sqr function.
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