I take it that's without any productivity modules anywhere. The reason for the 400 is that it includes both direct and indirect requirements: You need 160 directly for advanced circuits, but you also need 80 electronic circuits which use up 3 copper cables each, so 3x80 = 240 more copper cables. (You can see the relations if you click "Production Graph".)irbork wrote:EDIT
New copy of calculator.
Want - 40 - Advanced circuits.
Items to manufacture - 400 - Copper cable
Correct items to manufacture 160 copper cable.
If you don't want to include the requirements for the electronic circuits, put "TRUE" in the "Do not manufacture" column for them. Then it will stop there and just tell you how many finished electronic circuits you need.