How do you convert a stove from propane to natural gas?

Answer 1

It depends on the stove. Some require an adjustment of the orifices and regulator and some require replacement of orifices and adjustment to the regulator and still some require replacement of some orifices adjustment of others and adjustment to the regulator.

Without make and a model number it is difficult to give more specific details.

Answer 2

Orfice that a controls gas flow are different sized. Go to a hardware store and tell them what you want to do. They will sell you the right size and tell you how to change it.