Minor third (diatonic interval category)

A minor third (m3) is an interval that spans two scale steps in the diatonic scale with the minor (narrower) quality. It is generated by stacking 3 fourths octave reduced, and depending on the specific tuning, it ranges from 240 to 343 ¢ (1\5 to 2\7).

In just intonation, an interval may be classified as a minor third if it is reasonably mapped to two steps of the diatonic scale and four steps of the chromatic scale.

The minor third can be stacked with a diatonic major third to form a perfect fifth, and as such is often involved in chord structures in diatonic harmony.

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