Please try the below tool..its pretty much handy to use..
http://www.jvsg.com/download/IPDesignToolSetup.zip
details can be found in below link
http://www.video-home-surveillance.com/ipcameracalc/?r=details
few cons that I have noticed.
After installation, it completely disables my UAC ( best ever security feature given in Windows).
I really do not like my NVR software controlling the security settings of my computer.