I am thinking about building me a room add. Its not my everyday job but I want to do it myself. But I don't know how to figure for my rafters. And I don't want trusses. I'm not sure what pitch I want yet. Or how big my room is going to be yet. Thank you for your reply and help

You can't figure rafters until you determine pitch or size of the room. Once you make these decsions just lett usknow and we'll go from there. Try this for a start Hip Roof Framing Calculator - Ridge, Rafter, Hip + Jack Rafter - Online