To play F#aug on the piano, you need the notes F#, A#, D. On piano it is played from the keys F#, A#, D, root position first, then in inversions. This guide covers the augmented chord in full: what is in it, how to play it cleanly on the piano, where it fits musically and how to practise it.
What notes are in the F#aug chord?
The F#aug chord is a augmented chord, and its notes are fixed: F#, A#, D. Every voicing on every instrument uses these same notes, in some order and in some octave — change one of them and you are playing a different chord. The table below lists each note with its interval from the root F#, so you can see the structure of F#aug at a glance. On the piano, play the keys F#, A#, D slowly and listen for each note of F#aug in turn.
| Note | Interval |
|---|---|
| F# | Root |
| A# | 3 |
| D | #5 |
The root is F#, the note the chord is named after and the note your ear hears as home. Above it, the intervals in F#aug are 3, #5. That combination is what makes F#aug sound the way it does: the intervals decide the colour, and the root decides the pitch. On the piano, the notes appear in the order the fingering dictates, but the set of notes never changes.
F#aug sounds dreamlike and unresolved, a chord that seems to hover because its notes divide the octave evenly. Listen for that character when you play it — if F#aug does not sound that way, one of the notes is probably wrong, and the table above is the place to check. On the piano, play the keys F#, A#, D slowly and listen for each note of F#aug in turn.
Comparing F#aug with its closest relatives helps to fix it in your ear. In short, augmented against major: both have the major 3rd A#, but F#aug raises the 5th to D instead of the perfect 5th C#, and that one change removes the chord's sense of home. Play both chords slowly, one after the other, and notice which note moves. Naming that note out loud while you play is the fastest way to learn the difference. On the piano, F#aug is the keys F#, A#, D, and the inversions above move the same notes around.
How to play F#aug on piano
On the piano, F#aug is played from the keys F#, A#, D. In root position the lowest note is F#, the root, with the other notes stacked above it in the order F#, A#, D. Play it with the right hand first, then with the left hand an octave lower, so both hands know the shape of F#aug before you try it in a progression.
First inversion of F#aug puts A# in the bass, with the notes in the order A#, D, F#. The chord is still F#aug — the notes have not changed, only their order — but the bass note changes how it connects to the chord before and after it. Use this inversion when the bass line wants to step to A# rather than jump to F#, and practise moving from root position to this inversion without lifting your hand off the keys more than you must.
Second inversion of F#aug puts D in the bass, with the notes in the order D, F#, A#. The chord is still F#aug — the notes have not changed, only their order — but the bass note changes how it connects to the chord before and after it. Use this inversion when the bass line wants to step to D rather than jump to F#, and practise moving from root position to this inversion without lifting your hand off the keys more than you must.
For fingering, a good starting point for F#aug in root position in the right hand is thumb on F#, then one finger per note in order, with the little finger on the top note D. For the left hand, mirror it: little finger on the low F# and thumb on the top note. When a note is a black key — F#, A# — let your longer fingers take it, since they reach the black keys more easily. Practise F#aug in root position and first inversion, hands separately, then together, at a slow tempo, and use the Piano Chord Finder to check the voicing on the keyboard.
Common mistakes
These are the mistakes that most often make F#aug sound wrong on the piano, and each one has a concrete fix. Work through them one at a time rather than trying to fix everything at once.
Resolving it nowhere. Because it is symmetrical, F#aug can resolve in several directions, but it must resolve somewhere. Pick a destination chord and practise the move. On the piano, F#aug is the keys F#, A#, D, and the inversions above move the same notes around.
Confusing it with a whole-tone sound. The augmented triad is part of the whole-tone scale, but on its own it is just three notes: F#, A#, D. Do not add extra whole-tone notes unless you mean to. On the piano, play the keys F#, A#, D slowly and listen for each note of F#aug in turn.
Playing every inversion with the same hand shape. Each inversion of F#aug needs its own hand shape, because the notes sit under different fingers. If you force the root-position fingering onto an inversion, the hand cramps and notes get missed. Learn the fingering for each inversion of F#aug separately, hands apart, before you join them. On the piano, F#aug is the keys F#, A#, D, and the inversions above move the same notes around.
Playing a perfect 5th. If the 5th is C# the chord is just major. The sharpened 5th D is the whole point of the augmented chord. On the piano, F#aug is the keys F#, A#, D, and the inversions above move the same notes around.
Where F#aug is used
F#aug is not a diatonic triad in any major or minor key, because it is an extended or altered chord, but its base triad belongs to the key of C# major, the key of F# major, the key of B major. a surprise chord: because it is symmetrical, it can move to several different tonics. As a dominant-type chord it also points toward B major, the key a perfect fourth above F#, which is the tonic it most often resolves to. That is where F#aug does its work: not as a home chord, but as a chord that creates movement and then resolves. On the piano, F#aug is the keys F#, A#, D, and the inversions above move the same notes around.
Because F#aug is an extended or altered chord, it appears in progressions as a colour or a dominant rather than as a diatonic staple. Try it in place of the plain F# triad in a progression you already know, and listen to how the extra notes change the feel — that substitution is the usual way extended chords enter real music. The Chord Progression Builder lets you try F#aug in a progression in any key and hear how it connects to the chords around it. On the piano, F#aug is the keys F#, A#, D, and the inversions above move the same notes around.
The same chord on other instruments is covered in F#aug on guitar, F#aug on ukulele, F#aug on bass, and the scales that fit over it are the F# major scale and the F# minor pentatonic scale. Learning F#aug on the piano and then checking it on another instrument is one of the best ways to fix the notes — F#, A#, D — in your memory, because the notes stay the same while everything else changes.
Practising F#aug
A short worked example makes F#aug concrete. Play the four-chord progression B – F# – G#m – E in B major, the key F#aug most often resolves toward: B – F# – G#m – E. Play each chord for one bar at a slow tempo, and listen to how F#aug sounds in that sequence — whether it feels like home, like a lift, or like a chord on its way somewhere else. Then play the same four chords in a different order, starting on F#aug itself, and notice how its character changes when it opens the progression instead of sitting inside it. On the piano, play the keys F#, A#, D slowly and listen for each note of F#aug in turn.
For a second exercise, play F#aug and then the chord a fourth above F#, back and forth, four times each. That move — a chord and the chord a fourth above it — is the most common resolution in Western music, and it is the move F#aug is built for when it acts as a dominant. Finish by playing F#aug on its own, slowly, and naming each note out loud as you play it: F#, A#, D. Naming the notes while you play them is what turns a shape into knowledge you can use in any key. Test yourself with the Practice Chord Quiz and keep time with the Metronome as the tempo rises. On the piano, the root-position keys F#, A#, D show F#aug most clearly.
Frequently asked questions
What is the first inversion of F#aug?
The first inversion of F#aug puts A# in the bass, with the notes in the order A#, D, F#. The chord is still F#aug — only the bass note has changed — and it is the inversion to use when the bass line steps to A#.
Which fingers do you use for F#aug on piano?
In the right hand, start with the thumb on F# and one finger per note in order, ending with the little finger on D. In the left hand, mirror it with the little finger on the low F#. Longer fingers take the black keys, so check which notes of F#aug are black keys before you settle on a fingering.
Why does F#aug sound strange?
Its 5th is sharpened to D, so the chord is two major 3rds stacked and divides the octave into three equal parts. With no perfect 5th to anchor it, the chord sounds like it floats. On the piano, check the root-position keys above for that note.
What notes are in F#aug?
F#aug contains F#, A#, D: the root F#, the major 3rd A# and the augmented 5th D. The raised 5th is the note that makes it augmented. On the piano, check the root-position keys above for that note.
Where is F#aug used?
As a passing chord between a major chord and the chord a semitone above it, and as an altered dominant in jazz. It is a colour chord, used briefly for lift and surprise. On the piano, check the root-position keys above for that note.