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F#aug(Augmented Chord)

A major triad with a raised fifth. Creates a mysterious, unsettled sound.

Notes
F# – A# – D
Intervals (semitones)
0 – 4 – 8
Type
Triad

🎹 F#aug on Piano

Press highlighted keys simultaneously to play the F#aug chord.

R
F#(Root (R))
2
A#(Major 3rd)
3
D(Augmented 5th (♯5))

🎸 F#aug on Guitar

The F#aug chord uses notes F#, A#, D. Build a voicing by finding these notes on any strings — root on the 6th string is a common starting point for barre chord shapes.

Interval Analysis

DegreeInterval NameSemitonesNote in F#
RootRoot (R)0F#
3rdMajor 3rd4A#
5thAugmented 5th (♯5)8D

About the F# Augmented Chord

The F#aug chord (F# Augmented) consists of 3 notes: F#, A#, D. A major triad with a raised fifth. Creates a mysterious, unsettled sound.

To build any augmented chord, apply intervals of 0, 4, 8 semitones above the root. Starting from F#: the notes land on F#, A#, D.

Playing F#aug on Piano

Press F#, A#, D simultaneously. In root position, F# is lowest. First inversion places A# in the bass for a lighter sound; second inversion uses D as the bass note.

Common Chord Progressions Using F#aug

  • I–IV–V: F#aug – Baug – C#aug (blues and rock)
  • I–V–vi–IV: F#aug – C# – D#m – B (pop staple)
  • I–vi–IV–V: F#aug – D#m – B – C# (50s progression)

The F#aug Chord in Context

As a augmented chord, F#aug is the tonic (I) in the key of F# major. It also appears as the IV chord in C# major, and as the V chord in B major — making it one of the most important chords across all of Western music.

Other F# Chords

F#
Major
F#m
Minor
F#7
Dominant 7th
F#maj7
Major 7th
F#m7
Minor 7th
F#dim
Diminished

Augmented Chord in All 12 Keys

CaugC#augDaugD#augEaugFaugF#augGaugG#augAaugA#augBaug
🎹 Virtual Piano
Play F#aug on piano
🎸 Virtual Guitar
See on the fretboard
🎵 F# Scale
Notes that fit F#aug
🎶 Songs
Find songs using F#aug

FAQ

F#aug Chord — Frequently Asked Questions

What notes are in the F#aug chord?
The F# Augmented chord contains: F#, A#, D. These notes are derived by applying the augmented interval formula (0–4–8 semitones) to the root note F#.
What is the F#aug chord used for?
A major triad with a raised fifth. Creates a mysterious, unsettled sound. The F#aug chord is used across pop, rock, jazz, and classical music. As the I chord in the key of F# major, it functions as the most stable resting point in progressions.
How do you play F#aug on piano?
On piano, play F#, A#, D simultaneously. In root position, F# is the lowest note. Inversions move the bass note up — first inversion has A# lowest, second inversion has D lowest.
How many notes are in a augmented chord?
A augmented chord has 3 notes: F#, A#, D (in F#). It is a triad — the most fundamental chord type.
What is the difference between F# major and F# minor?
The F# major chord (F#–A#–C#) uses a major third (4 semitones), giving it a bright, happy sound. The F# minor chord (F#–A–C#) uses a minor third (3 semitones), giving it a darker, emotional sound.
What key does F#aug belong to?
F#aug naturally serves as the I chord in the key of F# major. It also appears as IV in the key of C# major, and as V in the key of B major.
Can I play F#aug on ukulele?
Yes. The ukulele uses GCEA tuning with 4 strings. The F#aug chord notes (F#, A#, D) can be fretted on a ukulele, though the shapes differ from guitar due to the 4-string layout and shorter scale.
What chords go well with F#aug?
In the key of F# major, F#aug pairs naturally with B major (IV), C# major (V), and D#m (vi). The classic I–IV–V (F#aug–B–C#) is the foundation of blues, country, and rock.
What is a chord inversion of F#aug?
An inversion places a non-root note in the bass. F#aug root position: F# in bass. First inversion: A# in bass. Second inversion: D in bass. Inversions create smoother bass line movement without changing the harmony.
How do I memorize the notes in a augmented chord?
Remember the formula: 0–4–8 semitones from root. For F#aug: start on F#, add 4 semitones, then 8 semitones. Practicing this across all 12 roots builds instant recognition of any augmented chord.