There ya go...
Sean Ware I think is the author's name. I first saw this and fell in love with it.
SWArmorCalc is in the "Reference" section.
Load the itembag in UOAssist vendor bag and refresh it. Copy the entire list. That's what you paste into SWArmorCalc.
There's also a way you can add in artifacts that aren't already included. You add it to registry entries.