As you know the note middle C in the treble clef is on the first ledger line below the stave and for the bass clef middle C is on the ledger line above the stave so if you have a note a 5th above...
Depending on what your reading, there are baritone players that read bass clef and those who read treble they are known as Baritone B.C (Bass) & Baritone T.C (treble) ao the answer is normally...
in treble clef all i know is c-13 d-12 e-1 f-1? g-0? sorry that's all i know well good luck on the baritonein bass clef for marching baritonee-123f-13Gb-23g-12ab-1a-2Bb-0b-123c-13Db-23