interval type distance in semi-tones Name Example
unison 0 perfect unison A-A
1 augmented unison A-A#
second 1 minor 2nd E-F
2 major 2nd B-C#
3 augmented 2nd Ab-B
third 2 diminished 3rd E-Gb
3 minor 3rd F-Ab
4 major 3rd G-B
5 augmented 3rd C-E#
fourth 4 diminished 4th B-Eb
5 perfect 4th G-C
6 augmented 4th F-B
fifth 6 diminished 5th F-Cb
7 perfect 5th Eb-Bb
8 augmented 5th D-A#
sixth 7 diminished 6th C#-Ab
8 minor 6th G-Eb
9 major 6th D-B
10 augmented 6th C-A#
seventh 9 diminished 7th C#-Bb
10 minor 7th C-Bb
11 major 7th D-C#
12 augmented 7th C-B#
