The calculator was intended to give you some idea as to gold content, you need to take into account for how much wear the items have but it gives you somewhere as a starting point rather than just trying to figure it out on your own.
The best places to find gold filled cheap enough to make a profit are yard sales, flea market, church thrift stores, etc. you can luck into some on ebay when you find some not listed as gold filled but you can see in the photos that some of it is gold filled, if they state gold filled in the title or description for get it as it will usually sell for way more than it is worth...
The best places to find gold filled cheap enough to make a profit are yard sales, flea market, church thrift stores, etc. you can luck into some on ebay when you find some not listed as gold filled but you can see in the photos that some of it is gold filled, if they state gold filled in the title or description for get it as it will usually sell for way more than it is worth...