I would ballpark it at 1.5 - 2.5 times what you normally eat. You can't carry it all, though, unless you are only riding for a couple of days. So you'll figure it out as you go along. No need to overthink it.

By the way, in your other thread you mention freeze dried camping meals - those are pretty awful, if I had to eat that stuff on tour I would get sick and lose a lot of weight. THey are loaded with sodium and other crap.