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If you upgrade to Skype 5.2+ all you need to do is select “Call” on the menu bar, then “Call Technical Info” and it will show you bandwidth usage in the Call Technical Info window. If you are using an older version of Skype and don’t want to update for some reason, you just have to go into Tools>Options>Advanced>Advanced Settings>Display Technical Info. Click “save”, and then just follow the same steps as in Skype 5.2.