The A Augmented chord contains A, C♯, E♯. Formula: 1–3–♯5.
The a augmented triad uses a root, major third and augmented fifth.
Preserve the written spelling E♯ even when it shares a piano key with a simpler enharmonic name.
Choose a position to keep the written notes, sounding keys, bass note, playback and print reference synchronized.
Aaug uses 1–3–♯5: A–C♯–E♯.
Compared with A major, raise the fifth by one semitone.
The chord tones stay the same while the lowest chord tone changes.
| Position | Symbol | Notes, low to high | Bass |
|---|---|---|---|
| Root position, current selection | Aaug | A3–C♯4–E♯4 | A3 |
| First inversion | Aaug/C♯ | C♯4–E♯4–A4 | C♯4 |
| Second inversion | Aaug/E♯ | E♯4–A4–C♯5 | E♯4 |
Fingerings are not included on this page. The diagram shows note positions, not a prescribed hand shape.
Use the written notes, keyboard positions and playback without treating the diagram as a required hand shape.
Read left- and right-hand finger numbersOpen Music Theory
Supports: augmented triad formula and written tone spelling
Scope: Supports the chord formula and spelling only; keyboard layouts are PianoGrid examples, and no fingering is assigned.
A, C♯, E♯.
1–3–♯5.
No. The root stays the same; the lowest chord tone changes.
Select the three pitch classes that make Aaug, then check your answer.
This one-octave exercise checks pitch classes. Order and octave do not affect the result; fingering and live performance are not assessed.
One octave, C through B. Select a key again to remove it.
Chord tones: A–C♯–E♯ · Formula: 1, 3, ♯5
Dots mark the notes to play. C4 is middle C. Numbers identify octaves, not fingers.