Bill Tindall, E.Tn.
I answered how much clearance for the jam in the framing opening. As others have said, about 1/8" wider than the door, each side. That said, if the door rubs it is easy to plane it to where it doesn't. Close the hinge you will be using and figure the opening will be your clearance on the hinge side. Bevel the door edge and you can get by with less clearance on the strike side.