I keep transposing notes to numerals so I made this little cheat sheet to speed up the process.

 0    1    2    3    4    5    6    7    8    9    10   11 
------------------------------------------------------------
 I    IIb  II  IIIb  III  IV   Vb   V    VIb  VI  VIIb  VII
------------------------------------------------------------
 Ab   A    Bb   B    C    Db   D    Eb   E    F    Gb   G 
 A    Bb   B    C    Db   D    Eb   E    F    Gb   G    Ab 
 Bb   B    C    Db   D    Eb   E    F    Gb   G    Ab   A
 B    C    Db   D    Eb   E    F    Gb   G    Ab   A    Bb 
 C    Db   D    Eb   E    F    Gb   G    Ab   A    Bb   B
 Db   D    Eb   E    F    Gb   G    Ab   A    Bb   B    C  
 D    Eb   E    F    Gb   G    Ab   A    Bb   B    C    Db
 Eb   E    F    Gb   G    Ab   A    Bb   B    C    Db   D  
 E    F    Gb   G    Ab   A    Bb   B    C    Db   D    Eb
 F    Gb   G    Ab   A    Bb   B    C    Db   D    Eb   E 
 Gb   G    Ab   A    Bb   B    C    Db   D    Eb   E    F   
 G    Ab   A    Bb   B    C    Db   D    Eb   E    F    Gb