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How to Convert String to Double in PowerShell

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In PowerShell, there are several ways to convert string to double in PowerShell.

The following methods show how you can do it with syntax.

Method 1: Using Convert.ToDouble() method

$doubleNumber = [System.Convert]::ToDouble($stringNumber)

This example will parse the string and convert it to a double.

Method 2: Using Double.TryParse() method

[double]::TryParse($stringNumber,[ref]$doubleValue)

This example will convert the string to a double.

Method 3: Using Casting

$doubleNumber = [double]$stringNumber

This example will convert the string to a double using casting.

Method 4: Using Parse() method

$doubleNumber = [double]::Parse($stringNumber)

The following examples show how you can use each of the methods.

Convert String to Double Using Convert.ToDouble() method

You can use the ToDouble() method to convert the string to a double.

# define a string 
$stringNumber = "293.15"

# convert string to double using ToDouble()
$doubleNumber = [System.Convert]::ToDouble($stringNumber)
Write-Output $doubleNumber

Output:

293.15

In this script, we defined a string variable $stringNumber that contains a number in string type.

To convert the string to a double, we used the ToDouble() method and passed the $stringNumber as an input parameter. It returns the double representation of string variable $stringNumber.

Finally, we use the Write-Output cmdlet to print the number to the console.

Convert String to Double Using TryParse() Method

A safe way to convert a string to a double is to use the [double]::TryParse() method in PowerShell. It attempts to convert the string and returns the true if the conversion succeeds or false if it fails.

# define a string representing double
$stringNumber = "20.02"
$doubleValue = 0
if([double]::TryParse($stringNumber,[ref]$doubleValue)){
    Write-Output "Double value is: $doubleValue"
} else {
   Write-Output "Conversion failed"
}

Output:

20.02

In this script, the $stringNumber variable contains the string representing double. We used the TryParse() method to convert the string to a double.

Finally, if the conversion succeeds, it prints the output using the Write-Output cmdlet.

Convert String to Double Using Casting

The easy way to convert string to a double is to use casting.

# define a string representing double
$stringNumber = "15.556"
$doubleNumber = [double]$stringNumber
Write-Output $doubleNumber

Output:

15.556

In this script, we used the [double] casting to convert a string to a double value.

Finally, it prints the double value using the Write-Output cmdlet in PowerShell.

Convert String to a Double Using Parse() Method

Another way to convert a string to a double value is to use the Parse() method in PowerShell.

# define a string representing double
$stringNumber = "20.02"
$doubleNumber = [double]::Parse($stringNumber)

Write-Output $doubleNumber

Output:

20.02

In this script, the $stringNumber variable contains the string representing double. We then use [double]::Parse() method which takes $stringNumber as an argument to convert a string to a double value.

Finally, we use the Write-Output cmdlet to print the double value.

Conclusion

I hope the above article on converting a string to a double in PowerShell is helpful to you.

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