The F augmented chord contains F, A and C♯. Written Faug or F+, it raises the fifth of F major from C to C♯ while keeping the root F and major third A.
Build the F augmented chord with degrees 1–3–♯5. F to A and A to C♯ are both major thirds, four semitones apart. The C♯ spelling identifies the raised fifth; D♭ uses the same piano key but a different letter name.
Preserve the written note spelling shown for this chord.
Choose a position to keep the written notes, sounding keys, bass note, playback and print reference synchronized.
In the exercise, select F, A and the C♯/D♭ key. The exercise checks the three pitch classes, regardless of their order, and reports missing or extra notes. It does not listen to your piano or assess hand movement.
Faug uses 1–3–♯5: F–A–C♯.
Compared with F 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 | Faug | F4–A4–C♯5 | F4 |
| First inversion | Faug/A | A4–C♯5–F5 | A4 |
| Second inversion | Faug/C♯ | C♯5–F5–A5 | C♯5 |
Use the F augmented chord diagrams to locate keys rather than finger numbers. Root position and both inversions preserve F, A and C♯ while changing which note is lowest. Choose a position above to compare its note order and sound.
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.
F, A and C♯, using formula 1–3–♯5. The augmented fifth distinguishes this triad from F major, which uses C natural.
F+ is another symbol for the F augmented chord. The plus sign describes the raised fifth of a three-note triad; it does not add a seventh.
A root-position triad uses the letters F–A–C. Raising C to C♯ preserves the fifth above F. D♭ sounds on the same key but describes a different written interval.
The first inversion puts A lowest; the second puts C♯ lowest. The same three chord tones remain present. Compare the selected keyboard diagram with the low-to-high note list.
Select the three pitch classes that make Faug, 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: F–A–C♯ · Formula: 1, 3, ♯5
Dots mark the notes to play. C4 is middle C. Numbers identify octaves, not fingers.