key roots indicated by numerals that don't have accidentals: E minor: Em7 becomes Im7 Fmø7 becomes IIø7 Gmaj7 becomes IIImaj7 (the assumed pitch for the root of a III numeral in E is G, and the is required to indicate that, in E minor, this chord is rooted on G) Am7 becomes IVm7 Bm7 becomes Vm7 Cmaj7 becomes VImaj7 D7 becomes VII7 This will frequently result in numerals whose accidentals are different than those of the actual root note, as they are referring to a change from the assumed pitch and not an absolute pitch: D minor: Dm7 becomes Im7 Emø7 becomes IIø7 Fmaj7 becomes III maj7 (the assumed pitch for the root of a III numeral in D is F, and the is required to indicate that, in D minor, this chord is rooted on F) Gm7 becomes IVm7 Am7 becomes Vm7 Bmaj7 becomes VI maj7 C7 becomes VII7 Further reading Baxter, John (2010). Deluxe Encyclopedia Of Mandolin Chords, p. 11. Mel Bay. . Musical scales