The scales below are described in terms of the intervals between successive notes. M2 is a Major second, or a whole step. m2 is a minor second, or a half step. A2 is an Augmented second, equivalent to a step and a half. d3 is a diminished third, equivalent to a whole step, (but requiring a skip in a letter name). m3 is a minor third, equivalent to a step and a half, (but requiring a skip in a letter name). Intervals other than M2 or m2 are underlined.
Major (Ionian) M2,M2,m2,M2,M2,M2,m2
Natural Minor (Aeolian) M2,m2,M2,M2,m2,M2,M2
Ascending Minor M2,m2,M2,M2,M2,M2,m2
Harmonic Minor M2,m2,M2,M2,m2,A2,m2
Dorian M2,m2,M2,M2,M2,m2,M2
Phrygian m2,M2,M2,M2,m2,M2,M2
Lydian M2,M2,M2,m2,M2,M2,m2
Mixolydian M2,M2,m2,M2,M2,m2,M2
Locrian m2,M2,M2,m2,M2,M2,M2
Whole Tone (see note below) M2,M2,M2,M2,M2,d3
Pentatonic Major M2,M2,m3,M2,m3
Pentatonic Minor m3,M2,M2,m3,M2
Enigmatic m2,A2,M2,M2,M2,m2,m2
Neapolitan m2,M2,M2,M2,M2,M2,m2
Neapolitan Minor m2,M2,M2,M2,m2,A2,m2
Hungarian Minor M2,m2,A2,m2,m2,A2,m2
Octatonic M2,m2,M2,m2,M2,m2,M2,m2
Dominant Diminished m2,M2,m2,M2,m2,M2,m2,M2
Note:
In the Whole Tone Scale the d3, diminished third interval, can be placed anywhere in the scale although it must appear at least once.