Information about the perfect undecime interval

Name

This interval is called: Perfect undecime

Abbreviation

You can use the somewhat shorter name "P11" to indicate a Perfect undecime.

Chord name

Eleventh

Construct

How to build a perfect undecime 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 perfect undecime from C3. Outcome: F4

1.
A Perfect undecime uses 11 naturals.
Example: C3 D3 E3 F3 G3 A3 B3 C4 D4 E4 F4
2.
A Perfect undecime has 17 semitones between the notes.
Example: C3 C#3 D3 D#3 E3 F3 F#3 G3 G#3 A3 A#3 B3 C4 C#4 D4 D#4 E4 F4

Cheatsheet

Tranposed for each note

You can use the following cheatsheet to check the Perfect undecime for each root note.
Cb3 ↠ Fb4
C3 ↠ F4
C3 ↠ F4
C3 ↠ F4
C#3 ↠ F#4
C3 ↠ F4
Db3 ↠ Gb4
D3 ↠ G4
D3 ↠ G4
D3 ↠ G4
D#3 ↠ G#4
D3 ↠ G4
Eb3 ↠ Ab4
E3 ↠ A4
E3 ↠ A4
E3 ↠ A4
E#3 ↠ A#4
E3 ↠ A4
Fb3 ↠ Bbb4
F3 ↠ B4
F3 ↠ Bb4
F3 ↠ B4
F#3 ↠ B4
F3 ↠ B4
Gb3 ↠ Cb5
G3 ↠ C5
G3 ↠ C5
G3 ↠ C5
G#3 ↠ C#5
G3 ↠ C5
Ab3 ↠ Db5
A3 ↠ D5
A3 ↠ D5
A3 ↠ D5
A#3 ↠ D#5
A3 ↠ D5
Bb3 ↠ Eb5
B3 ↠ E5
B3 ↠ E5
B3 ↠ E5
B#3 ↠ E#5
B3 ↠ E5