F♯ augmented (F♯aug) chord on piano

Looking for the F♯aug chord on piano? It is an augmented triad (two major thirds), made of three notes: F♯ – A♯ – C𝄪. The same chord with a different spelling: G♭ augmented (G♭aug).

Root position: F♯4 – A♯4 – C𝄪5

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What the F♯aug chord sounds like

An augmented triad is two stacked major thirds. It sounds floating, dreamlike and unresolved, and is often a passing chord (e.g. C → Caug → F or Am).

Notes of the F♯aug chord

Degree	Note	Interval from the root
1	F♯	root
3	A♯	major third (4 semitones)
5	C𝄪	augmented fifth (8 semitones)

Root position and inversions

An inversion uses the same notes, with a different note at the bottom. When you change chords, choosing the nearest inversion keeps your hand almost still.

Root position

F♯4 – A♯4 – C𝄪5

1st inversion

A♯4 – C𝄪5 – F♯5

2nd inversion

C𝄪5 – F♯5 – A♯5

Which keys is it in?

The F♯aug chord is built from the notes of these keys (for minor keys, both the natural and the harmonic minor are considered):

D♯ minor: III+

Similar chords and substitutes

If F♯aug is too hard, or you want a different colour in the same spot, these chords are worth a try.

Substitutes (by function)

F♯ – the raised fifth falls back to a perfect fifth
B – as a passing chord it resolves here (V+ → I)

Same notes

Daug – the same notes with a different root
B♭aug – the same notes with a different root

Frequently asked questions

What notes are in the F♯aug chord?

F♯, A♯, C𝄪. The root is F♯; the intervals of the other notes from the root: major third, augmented fifth.

How do I play the F♯aug chord on piano?

In root position, the right hand usually plays with fingers 1, 3 and 5 (thumb, middle finger, little finger); four-note chords with fingers 1, 2, 3 and 5. The left hand mirrors this: 5, 3, 1. In an inversion the top or bottom note moves to the other side, so your hand moves less when you change chords.

How is the F♯aug chord written?

The chord symbol is F♯aug (also written F#aug), and its full name is F♯ augmented.