Intervals

½ steps	Name	Spelling	Inversion
0	Perfect Unison	P1 = 1	P8 = 8
1	minor 2nd	m2 = b2	M7 = 7
2	Major 2nd	M2 = 2	m7 = b7
3	minor 3rd Augmented 2nd	m3 = b3 A2 = #2	M6 = 6 d7 = bb7
4	Major 3rd	M3 = 3	m6 = b6
5	Perfect 4th	P4 = 4	P5 = 5
6	Augmented 4th diminished 5th	A4 = #4 d5 = b5	d5 = b5 A4 = #4
7	Perfect 5th	P5 = 5	P4 = 4
8	Augmented 5th minor 6th	A5 = #5 m6 = b6	d4 = b4 M3 = 3
9	Major 6th diminished 7th	M6 = 6 d7 = bb7	m3 = b3 A2 = #2
10	minor 7th	m7 = b7	M2 = 2
11	Major 7th	M7 = 7	m2 = b2
12	Perfect Octave	P8 = 8	P1 = 1