Chord · F# Augmented
F♯aug Chord
F♯aug is F#, A# and D — unsettled, dreamlike; symmetrical.
F♯aug on every instrument
The same 3 notes, 6 sets of hands. Open a diagram for alternate shapes, audio and the mistakes to avoid.
What F♯aug is made of
F# Augmented (F# augmented) is built from the notes F#, A#, D, with the interval pattern 1, 3, #5. A common augmented chord across many styles.
Stack 1, 3 and #5 on a root of F♯ and you get F#, A# and D. That interval recipe is what makes the chord an augmented chord — move the same shape to another root and the character travels with it, which is why Caug sounds like a transposed F♯aug.
Augmented: Unsettled, dreamlike; symmetrical.
Spelling: the notes above are written the way a score would write them, not simplified to the nearest piano key. That is why this chord is spelled with F♯ rather than its enharmonic equivalent.
Keys that contain F♯aug
No major or natural-minor key contains all 3 of these notes — this one gets borrowed.
Chords like this one sit outside the diatonic set — they arrive as secondary dominants, borrowed chords or passing harmony. Browse every key to see which progressions pull it in.
Other chords on F♯
Same root, different colour.
The same augmented shape, moved
The identical interval recipe, built on other roots.
Questions people ask about F#aug
- What notes are in the F#aug chord?
- F#aug is made of F#, A# and D — the 1, 3 and #5 degrees of an augmented chord built on F#.
- What keys use the F#aug chord?
- No major or natural-minor key contains all 3 notes of F#aug. Chords like this arrive as borrowed harmony — secondary dominants, harmonic-minor colour, or chromatic passing chords — rather than as one of a key's native chords.
- How do you play F#aug on guitar and piano?
- This page shows F#aug on guitar, piano, ukulele, bass, mandolin and banjo — 9 voicings in total. Each diagram links to the full instrument page with alternate shapes, audio and common mistakes.
- Is F#aug the same as Gbaug?
- Yes. F#aug and Gbaug are enharmonic — identical pitches written two different ways. Which spelling you use depends on the key you are in; F#aug is the spelling this site treats as canonical.
Learn the theory behind it
Why F♯aug behaves the way it does — the guides that explain the chord instead of just spelling it.