Augmented Triads (Aug) | Guitar Diagrams | Root & Inverted Voicings | Close and Open Positions

Construction

An augmented triad is built by stacking a root (1), a major third (3) and an augmented fifth (#5).

It can be seen as a major triad with an augmented fifth (or a sharp fifth).

It means that you can take the 5th tone of the major triad and move it up one half step (one fret on the guitar).

Because of the #5, they sound unstable and tense when played in a chord progression, so they must be used carefully and in the appropriate context.

Since there’s no clear "home" note, augmented chords create a floating, unresolved feeling—great for modulation and tension in jazz, classical, and film music.

As shown in the chart below, to build a C augmented triad, we need to play C (the root), E (the major third) and G# (the augmented fifth).

It is noted Caug or even abbreviated with a + sign ; C+.

C augmented triad	C	E	G#
Formula	1	3	#5

Symmetry

The augmented triad is symmetrical because it consists of two identical intervals—major thirds stacked on top of each other.

This unique structure gives it interesting properties:

In C augmented (C, E, G♯):

C → E is a major third (4 semitones)

E → G♯ is another major third (4 semitones)

This means if you shift the chord up by a major third, you get another inversion of the same augmented triad.

Since an augmented chord cycles every major third, there are only three unique augmented chords:

Caug (C, E, G♯)

C♯aug (C♯, F, A)

Daug (D, F♯, A♯)

(The same pattern repeats for all other keys.)

Closed Triads

All the notes of the closed triad chords are placed as close together as possible unlike open triads whose notes are spead out and cover more than an octave.

Closed Positions

The four guitar diagrams below show how to play augmented triads in closed positions. They are organized into four categories.

Bass on the sixth string.
Bass on the fifth string.
Bass on the fourth string.
Bass on the third string.

There are 3 different voicings in each category. 1 root position and its two related inverted positions :

Root position (blue)
Third in the bass (1st inversion) in green.
Fifth in the bass (2nd inversion) in orange.

Here are the voicings

Root position	R	3	#5
1st inversion (third in the bass)	3	#5	R
2nd inversion (fifth in the bass)	#5	R	3

Root Positions and Inversions

The notes of the root position are in the order (1-3-#5) unlike the inverted positions which have their notes in a different order, so the third or the sharp fifth can be in the bass. Thus giving three different augmented triad voicings.

Symmetry

You will notice that some diagrams have identical shapes because of the symmetry of the augmented triads.

Indeed, the interval (4 semitones) between the root and the major third is the same as the distance between the major third and the augmented fifth and as the distance between the augmented fifth and the root.

Augmented Triad Chords | Open Voicings

Open Triads

An open voicing (or open position) is a way of arranging the notes of a chord so that they are spread out over a wider range, rather than being clustered closely together (which would be called closed voicing).

The 3 guitar neck diagrams show how to play augmented triads in open positions.

Root position (root in the bass)	R	#5	3
1st inversion (minor third in the bass in the bass)	3	R	#5
2nd inversion (diminished fifth in the bass)	#5	3	R

Chords / Triads Relationships

You can see in the following chart what are the notes are highlighted when an augmented triad is played starting on a specific degree of a given chord.

CHORD TYPE	AUGMENTED TRIAD STARTING ON	TRIAD ANALYSIS	CHORD	TRIAD
Aug	1 3 #5	1 3 #5	Caug	C+ E+ G#+
min	b3 5 7	b3 5 7	Cm	Eb+ G+ B+
minMaj7	b3 5 7	b3 5 7	CminMaj7	Eb+ G+ B+
7	2 #4 7	7 9 #11	C7	D+ F#+ Bb+
7#5	1 3 #5	1 3 #5	C7#5	C+ E+ G#+
7sus4b9	b2 4 6	b9 11 13	C7sus4b9	Db+ F+ A+
7	2 #4 7	7 9 #11	C7#11	D+ F#+ Bb+
7b5	2 b5 7	7 9 b5	C7b5	D+ F#+ Bb+
7#11	2 #4 7	7 9 #11	C9#11	D+ F#+ Bb+
m7b5	2 b5 7	7 9 #11	cm7b5	D+ F#+ Bb+
m9b5	2 b5 7	7 9 #11	cm9b5	D+ F#+ Bb+

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Last edited: 2026-02-19