List size of each web application into excel file

Tell me what version of sharepoint do you have, and what version of powershell.

Windows 2008 R2 (Powershell V2)

Sharepoint 2010 SP1

jessc7 thanks, it's working perfect, how can I calculate the size in MB?

Thanks in advance,

I already discover how to convert to MB

I'm using the following script:
 

Get-SPWebApplication | ForEach {$_.ContentDatabases} | Select WebApplication, Name, @{Label ="Size in MB"; Expression = {$_.disksizerequired/1024/1024}}, CurrentSiteCount | Out-File gonza.txt

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But I cannot see the complete name of the Web Application I see like this: SPWebApplication...

I would like to see the fullname of the Web Application

Thanks a lot for your help:

This is the final version of the script:

 

Get-SPWebApplication | ForEach {$_.ContentDatabases} | Select WebApplication, Name, @{Label ="Size in MB"; Expression = {$_.disksizerequired/1024/1024}}, CurrentSiteCount | Sort-Object "Size in MB" -Descending | Out-File WebAppSize.txt

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Thanks for the points, and thanks for posting your final solution!