C Major

no sharps or flats

F Major

one flat

G Major

one sharp

Bb Major

two flats

D Major

two sharps

Eb Major

three flats

A Major

three sharps

Ab Major

four flats

E Major

four sharps

Db Major

five flats

B Major

five sharps

Gb Major

six flats

F# Major

six sharps

Cb Major

seven flats

C# Major

seven sharps