Ref: Diatonic Keys for Triads

This page shows which major, minor, and harmonic minor keys a particular triad is diatonic to. Find the chord that you want to know which keys it belongs to in the left-most column, then look for the x's on that row for all the keys.

  • () - Natural Minor Only
  • [] - Harmonic Minor Only
Key/
Chd
A A/
B
B C C/
D
D D/
E
E F F/
G
G G/
A
A I (VII) VI [V] IV (III)
Am i vi (v) iv iii ii
A+ [III+]
A° [vii°] ii°
Key/
Chd
A A/
B
B C C/
D
D D/
E
E F F/
G
G G/
A
A/B I (VII) VI [V] IV (III)
A/Bm i vi (v) iv iii ii
A/B+ [III+]
A/B° [vii°] ii°
Key/
Chd
A A/
B
B C C/
D
D D/
E
E F F/
G
G G/
A
B I (VII) VI [V] IV (III)
Bm ii i vi (v) iv iii
B+ [III+]
B° ii° [vii°]
Key/
Chd
A A/
B
B C C/
D
D D/
E
E F F/
G
G G/
A
C (III) I (VII) VI [V] IV
Cm ii i vi (v) iv iii
C+ [III+]
C° ii° [vii°]
Key/
Chd
A A/
B
B C C/
D
D D/
E
E F F/
G
G G/
A
C/D (III) I (VII) VI [V] IV
C/Dm iii ii i vi (v) iv
C/D+ [III+]
C/D° ii° [vii°]
Key/
Chd
A A/
B
B C C/
D
D D/
E
E F F/
G
G G/
A
D IV (III) I (VII) VI [V]
Dm iv iii ii i vi (v)
D+ [III+]
D° ii° [vii°]
Key/
Chd
A A/
B
B C C/
D
D D/
E
E F F/
G
G G/
A
D/E IV (III) I (VII) VI [V]
D/Em iv iii ii i vi (v)
D/E+ [III+]
D/E° ii° [vii°]
Key/
Chd
A A/
B
B C C/
D
D D/
E
E F F/
G
G G/
A
E [V] IV (III) I (VII) VI
Em (v) iv iii ii i vi
E+ [III+]
E° ii° [vii°]
Key/
Chd
A A/
B
B C C/
D
D D/
E
E F F/
G
G G/
A
F VI [V] IV (III) I (VII)
Fm (v) iv iii ii i vi
F+ [III+]
F° ii° [vii°]
Key/
Chd
A A/
B
B C C/
D
D D/
E
E F F/
G
G G/
A
F/G VI [V] IV (III) I (VII)
F/Gm vi (v) iv iii ii i
F/G+ [III+]
F/G° ii° [vii°]
Key/
Chd
A A/
B
B C C/
D
D D/
E
E F F/
G
G G/
A
G (VII) VI [V] IV (III) I
Gm vi (v) iv iii ii i
G+ [III+]
G° ii° [vii°]
Key/
Chd
A A/
B
B C C/
D
D D/
E
E F F/
G
G G/
A
G/A (VII) VI [V] IV (III) I
G/Am vi (v) iv iii ii i
G/A+ [III+]
G/A° [vii°] ii°