You can use the CDbl function in VBA to convert a text string to a double data type.
Here is a common way to use this function in practice:
Sub ConvertStringToDouble()
Dim i As Integer
For i = 2 To 11
If IsNumeric(Range("A" & i)) Then
Range("B" & i) = CDbl(Range("A" & i))
Else
Range("B" & i) = 0
End If
Next i
End Sub
This particular macro will convert each string in the range A2:A11 to a double data type only if the string is a number.
Otherwise, the string will be converted to a value of zero.
The following example shows how to use this syntax in practice.
Example: Convert String to Double in VBA
Suppose we have the following column of values in Excel that are currently formatted as text strings:
Suppose we would like to convert each string to a double data type only if the string is a number and display them in column B.
We can create the following macro to do so:
Sub ConvertStringToDouble()
Dim i As Integer
For i = 2 To 11
If IsNumeric(Range("A" & i)) Then
Range("B" & i) = CDbl(Range("A" & i))
Else
Range("B" & i) = 0
End If
Next i
End Sub
When we run this macro, we receive the following output:
Notice that only the text strings in column A that are numbers are converted to double data types in column B.
Otherwise, the text strings are simply converted to a value of zero.
Note: You can find the complete documentation for the VBA CDbl function here.
Additional Resources
The following tutorials explain how to perform other common tasks in VBA:
How to Convert String to Integer in VBA
How to Convert String to Long in VBA