Information about the diminished fourth interval

Name

This interval is called: Diminished Fourth

Abbreviation

You can use the somewhat shorter name "d4" to indicate a Diminished Fourth.

Construct

How to build a diminished fourth 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 fourth from C3. Outcome: Fb3

1.
A Diminished Fourth uses 4 naturals.
Example: C3 D3 E3 F3
2.
A Diminished Fourth has 4 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 A4 Bb4 B4 C5

Cheatsheet

Tranposed for each note

You can use the following cheatsheet to check the Diminished Fourth for each root note.
Cb3 ↠ Fbb3
C3 ↠ F3
C3 ↠ Fb3
C3 ↠ F3
C#3 ↠ F3
C3 ↠ F3
Db3 ↠ Gbb3
D3 ↠ G3
D3 ↠ Gb3
D3 ↠ G3
D#3 ↠ G3
D3 ↠ G3
Eb3 ↠ Abb3
E3 ↠ A3
E3 ↠ Ab3
E3 ↠ A3
E#3 ↠ A3
E3 ↠ A3
Fb3 ↠ Bbbb3
F3 ↠ Bb3
F3 ↠ Bbb3
F3 ↠ B3
F#3 ↠ Bb3
F3 ↠ B3
Gb3 ↠ Cbb4
G3 ↠ C4
G3 ↠ Cb4
G3 ↠ C4
G#3 ↠ C4
G3 ↠ C4
Ab3 ↠ Dbb4
A3 ↠ D4
A3 ↠ Db4
A3 ↠ D4
A#3 ↠ D4
A3 ↠ D4
Bb3 ↠ Ebb4
B3 ↠ E4
B3 ↠ Eb4
B3 ↠ E4
B#3 ↠ E4
B3 ↠ E4