Information about the augmented fourth interval

Name

This interval is called: Augmented fourth

Abbreviation

You can use the somewhat shorter name "A4" to indicate a Augmented fourth.

Construct

How to build a augmented 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 augmented fourth from C3. Outcome: F#3

1.
A Augmented fourth uses 4 naturals.
Example: C3 D3 E3 F3
2.
A Augmented fourth has 6 semitones between the notes.
Example: C3 C#3 D3 D#3 E3 F3 F#3

Cheatsheet

Tranposed for each note

You can use the following cheatsheet to check the Augmented fourth for each root note.
Cb3 ↠ F3
C3 ↠ F3
C3 ↠ F#3
C3 ↠ F3
C#3 ↠ F##3
C3 ↠ F3
Db3 ↠ G3
D3 ↠ G3
D3 ↠ G#3
D3 ↠ G3
D#3 ↠ G##3
D3 ↠ G3
Eb3 ↠ A3
E3 ↠ A3
E3 ↠ A#3
E3 ↠ A3
E#3 ↠ A##3
E3 ↠ A3
Fb3 ↠ Bb3
F3 ↠ B3
F3 ↠ B3
F3 ↠ B3
F#3 ↠ B#3
F3 ↠ B3
Gb3 ↠ C4
G3 ↠ C4
G3 ↠ C#4
G3 ↠ C4
G#3 ↠ C##4
G3 ↠ C4
Ab3 ↠ D4
A3 ↠ D4
A3 ↠ D#4
A3 ↠ D4
A#3 ↠ D##4
A3 ↠ D4
Bb3 ↠ E4
B3 ↠ E4
B3 ↠ E#4
B3 ↠ E4
B#3 ↠ E##4
B3 ↠ E4