| Major key,Number of flats,Flat notes,Minor key,Enharmonic equivalent | |
| C major,0,-,A minor,None | |
| F major,1,B♭,D minor,None | |
| B♭ major,2,"B♭, E♭",G minor,None | |
| E♭ major,3,"B♭, E♭, A♭",C minor,None | |
| A♭ major,4,"B♭, E♭, A♭, D♭",F minor,None | |
| D♭ major,5,"B♭, E♭, A♭, D♭, G♭",B♭ minor,C♯ major/A♯ minor | |
| G♭ major,6,"B♭, E♭, A♭, D♭, G♭, C♭",E♭ minor,F♯ major/D♯ minor | |
| C♭ major,7,"B♭, E♭, A♭, D♭, G♭, C♭, F♭",A♭ minor,B major/G♯ minor | |