Intervals Tables

Increasing one half step at time

Semitones	Interval Number	Interval Name	Alt. Shorthand	Descriptive Name	Whole Tones + Half Tones
0	1	Perfect Unison	P1	Unison	0
1	2-	Minor Second	m2	Half step	0 + 1
2	2	Major Second	M2	Whole step	1
3	3-	Minor Third	m3	A tone and a half	1 + 1
4	3	Major Third	M3	Two whole tones	2
5	4	Perfect Fourth	P4	Two and a half tones	2 + 1
6	4+/5-	Augmented Fourth / Diminished Fifth	A4/d5	Tritone	3
7	5	Perfect Fifth	P5	Three and a half tones	3 + 1
8	5+/6-	Augmented Fifth / Minor Sixth	A5/m6	Four whole tones	4
9	6	Major Sixth	M6	Four and a half tones	4 + 1
10	7-	Minor Seventh	m7	Five whole tones	5
11	7	Major Seventh	M7	Five and a half tones	5 + 1
12	8	Perfect Octave	P8	Six whole tones	6
13	9-	Minor Ninth	m9	Octave + half step	6 + 1
14	9	Major Ninth	M9	Octave + whole step	7
15	10-	Minor Tenth	m10	Octave + minor third	7 + 1
16	10	Major Tenth	M10	Octave + major third	8
17	11	Perfect Eleventh	P11	Octave + perfect fourth	8 + 1
18	11+/12-	Augmented Eleventh / Diminished Twelfth	A11/d12	Octave + tritone	9
19	12	Perfect Twelfth	P12	Octave + perfect fifth	9 + 1
20	12+/13-	Augmented Twelfth / Minor Thirteenth	A12/m13	Octave + minor sixth	10
21	13	Major Thirteenth	M13	Octave + major sixth	10 + 1
22	14-	Minor Fourteenth	m14	Octave + minor seventh	11
23	14	Major Fourteenth	M14	Octave + major seventh	11 + 1
24	15	Perfect Fifteenth	P15	Double octave	12

Semitones	Interval Number	Interval Name	Alt. Shorthand	Descriptive Name	Whole Tones + Half Tones
0	1	Perfect Unison	P1	Unison	0
-1	2-	Minor Second	m2	Down a half step	0 + 1
-2	2	Major Second	M2	Down a whole step	1
-3	3-	Minor Third	m3	Down a tone and a half	1 + 1
-4	3	Major Third	M3	Down two whole tones	2
-5	4	Perfect Fourth	P4	Down two and a half tones	2 + 1
-6	4+/5-	Augmented Fourth / Diminished Fifth	A4/d5	Down three whole tones	3
-7	5	Perfect Fifth	P5	Down three and a half tones	3 + 1
-8	5+/6-	Augmented Fifth / Minor Sixth	A5/m6	Down four whole tones	4
-9	6	Major Sixth	M6	Down four and a half tones	4 + 1
-10	7-	Minor Seventh	m7	Down five whole tones	5
-11	7	Major Seventh	M7	Down five and a half tones	5 + 1
-12	8	Perfect Octave	P8	Down six whole tones	6
-13	9-	Minor Ninth	m9	Down an octave + a half step	6 + 1
-14	9	Major Ninth	M9	Down an octave + whole step	7
-15	10-	Minor Tenth	m10	Down an octave + minor third	7 + 1
-16	10	Major Tenth	M10	Down an octave + major third	8
-17	11	Perfect Eleventh	P11	Down an octave + perfect fourth	8 + 1
-18	11+/12-	Augmented Eleventh / Diminished Twelfth	A11/d12	Down an octave + tritone	9
-19	12	Perfect Twelfth	P12	Down an octave + perfect fifth	9 + 1
-20	12+/13-	Augmented Twelfth / Minor Thirteenth	A12/m13	Down an octave + minor sixth	10
-21	13	Major Thirteenth	M13	Down an octave + major sixth	10 + 1
-22	14-	Minor Fourteenth	m14	Down an octave + minor seventh	11
-23	14	Major Fourteenth	M14	Down an octave + major seventh	11 + 1
-24	15	Perfect Fifteenth	P15	Down two octaves	12