Information about the diminished tredecime interval

Name

This interval is called: Diminished tredecime

Abbreviation

You can use the somewhat shorter name "m13" to indicate a Diminished tredecime.

Chord name

Flat thirteenth

Construct

How to build a diminished tredecime 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 tredecime from C3. Outcome: Ab4

1.
A Diminished tredecime uses 13 naturals.
Example: C3 D3 E3 F3 G3 A3 B3 C4 D4 E4 F4 G4 A4
2.
A Diminished tredecime has 20 semitones between the notes.
Example: C3 Db3 D3 Eb3 E3 F3 Gb3 G3 Ab3 A3 Bb3 B3 C4 Db4 D4 Eb4 E4 F4 Gb4 G4 Ab4

Cheatsheet

Tranposed for each note

You can use the following cheatsheet to check the Diminished tredecime for each root note.
Cb3 ↠ Abb4
C3 ↠ A4
C3 ↠ Ab4
C3 ↠ A4
C#3 ↠ A4
C3 ↠ A4
Db3 ↠ Bbb4
D3 ↠ B4
D3 ↠ Bb4
D3 ↠ B4
D#3 ↠ B4
D3 ↠ B4
Eb3 ↠ Cb5
E3 ↠ C5
E3 ↠ C5
E3 ↠ C5
E#3 ↠ C#5
E3 ↠ C5
Fb3 ↠ Dbb5
F3 ↠ D5
F3 ↠ Db5
F3 ↠ D5
F#3 ↠ D5
F3 ↠ D5
Gb3 ↠ Ebb5
G3 ↠ E5
G3 ↠ Eb5
G3 ↠ E5
G#3 ↠ E5
G3 ↠ E5
Ab3 ↠ Fb5
A3 ↠ F5
A3 ↠ F5
A3 ↠ F5
A#3 ↠ F#5
A3 ↠ F5
Bb3 ↠ Gb5
B3 ↠ G5
B3 ↠ G5
B3 ↠ G5
B#3 ↠ G#5
B3 ↠ G5