My remodel diagram lists the existing water heater and new stove, but the plan only calls for those lines to be plumbed. The current house line I believe is 3/4 and that services the existing furnace, hot water heater and stove.
My thought was that the gas line sizing would be easy to figure out and I envisioned using an online calculator taking in appliance BTU info and run lengths, but I didn't find anything like that and there seems to be a lot factors that I'm not so interested in digging into. I'm working on our remodel plan and some gas changes are needed.