8Mbps / 512kbps. If you are signed in to Skype but not making any calls, Skype will use on average 0-4kbps. When you make a call, Skype will use on average between 24-128kbps. You can find out how much bandwidth a video call is using.To find out if your internet connection is fast enough to make a Skype call (using Skype for Windows Desktop): 1  In the Contact list, select the contact you wish to call.2  In the conversation header, click the Check settings button. 3  In the Connection tab, click Test Now.ou can find out how much bandwidth a video call is using. To find out if your internet connection is fast enough to make a Skype call (using Skype for Windows Desktop): 1  In the Contact list, select the contact you wish to call.