Information about the diminished duodecime interval

Name

This interval is called: Diminished duodecime

Abbreviation

You can use the somewhat shorter name "d12" to indicate a Diminished duodecime.

Chord name

Flat fifth

Construct

How to build a diminished duodecime interval?

To construct an interval correctly you must always use two steps.

  1. Count the amount of naturals used
  2. Count the steps between de two notes

At first, and with easy intervals, this may seem unnecessary, but when advancing to more dificult intervals and musical keys they will become more mandatory.

The following example is for a diminished duodecime from C3. Outcome: Gb4

1.
A Diminished duodecime uses 12 naturals.
Example: C3 D3 E3 F3 G3 A3 B3 C4 D4 E4 F4 G4
2.
A Diminished duodecime has 18 semitones between the notes.
Example: C3 Db3 D3 Eb3 E3 F3 Gb3 G3 Ab3 A3 Bb3 B3 C4 Db4 D4 Eb4 E4 F4 Gb4

Cheatsheet

Tranposed for each note

You can use the following cheatsheet to check the Diminished duodecime for each root note.
Cb3 ↠ Gbb4
C3 ↠ G4
C3 ↠ Gb4
C3 ↠ G4
C#3 ↠ G4
C3 ↠ G4
Db3 ↠ Abb4
D3 ↠ A4
D3 ↠ Ab4
D3 ↠ A4
D#3 ↠ A4
D3 ↠ A4
Eb3 ↠ Bbb4
E3 ↠ B4
E3 ↠ Bb4
E3 ↠ B4
E#3 ↠ B4
E3 ↠ B4
Fb3 ↠ Cbb5
F3 ↠ C5
F3 ↠ Cb5
F3 ↠ C5
F#3 ↠ C5
F3 ↠ C5
Gb3 ↠ Dbb5
G3 ↠ D5
G3 ↠ Db5
G3 ↠ D5
G#3 ↠ D5
G3 ↠ D5
Ab3 ↠ Ebb5
A3 ↠ E5
A3 ↠ Eb5
A3 ↠ E5
A#3 ↠ E5
A3 ↠ E5
Bb3 ↠ Fb5
B3 ↠ F5
B3 ↠ F5
B3 ↠ F5
B#3 ↠ F#5
B3 ↠ F5