Interval Cheatsheet

Semitones	Minor, major, or perfect intervals	Short	Simple Equivalent	Augmented or diminished intervals	Short	Widely used alternative names	Short
0	Perfect unison	1P		Diminished second	2d
1	Minor second	2m		Augmented unison	1A	Semitone, half tone, half step	S
2	Major second	2M		Diminished third	3d	Tone, whole tone, whole step	T
3	Minor third	3m		Augmented second	2A
4	Major third	3M		Diminished fourth	4d
5	Perfect fourth	4P		Augmented third	3A
6				Diminished fifth	5d	Tritone	TT
6	Augmented fourth	4A
7	Perfect fifth	5P		Diminished sixth	6d
8	Minor sixth	6m		Augmented fifth	5A
9	Major sixth	6M		Diminished seventh	7d
10	Minor seventh	7m		Augmented sixth	6A
11	Major seventh	7M		Diminished octave	8d
12	Perfect octave	8P		Augmented seventh	7A
12				Diminished ninth	9d
13	Minor ninth	9m	Minor second (2m)	Augmented octave	8A
14	Major ninth	9M	Major second (2M)	Diminished tenth	10d
15	Minor tenth	10m	Minor third (3m)	Augmented ninth	9A
16	Major tenth	10M	Major third (3M)	Diminished eleventh	11d
17	Perfect eleventh	11P	Perfect fourth (4P)	Augmented tenth	10A
18			Diminished fifth (5d) / Augmented fourth (4A)	Diminished twelfth	12d
18	Augmented eleventh	11A
19	Perfect twelfth or Tritave	12P	Perfect fifth (5P)	Diminished thirteenth	13d
20	Minor thirteenth	13m	Minor sixth (6m)	Augmented twelfth	12A
21	Major thirteenth	13M	Major sixth (6M)	Diminished fourteenth	14d
22	Minor fourteenth	14m	Minor seventh (7m)	Augmented thirteenth	13A
23	Major fourteenth	14M	Major seventh (7M)	Diminished fifteenth	15d
24	Perfect fifteenth or Double octave	15P	Perfect octave (8P)	Augmented fourteenth	14A
25			Minor second (2m)	Augmented fifteenth	15A