Fifths can be perfect, augmented or diminished. Below you can see that the number of steps determines the quality of the interval:

Perfect fifth, 3 1/2 whole steps or 7 half steps:

perfect fifth

Augmented fifth, 4 whole steps or 8 half steps:

augmented fifth

Diminished fifth, 3 whole steps or 6 half steps:

diminished fifth

Identifying fifths

When analyzing the quality of a fifth we should know that:

If there are accidentals you should identify the interval without accidentals and then analyze the effect of the accidentals.

Example: D-A#:

Another example: G-Db:

Identifying fifths by counting whole and half steps is slow and confusing.

See I > Intervals for related entries. To learn about go to Tutorials > Intervals.

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José Rodríguez Alvira.