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F♯ Diminished Chord: Guitar, Piano and Notes

The F♯ Diminished chord is built on the root note F♯. Its notes are F♯, A and C. It's enharmonically the same chord as G♭ Diminished.

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Quality
Short answer

Diminished chords sound unstable and suspenseful. Two stacked minor thirds create a tight, dissonant tension that composers use for passing chords, horror scores and dramatic turnarounds.

Notes
F♯ · A · C
Formula
1 · ♭3 · ♭5
Semitones
0 · 3 · 6
Note
F♯
Quality
Diminished
Symbol
F♯°

F♯ Diminished on piano

3 notes
View:
Piano diagram of the F♯ Diminished chord

Switch to the interactive diagram to hear the chord, change voicing and swap finger numbers for note names.

To play F♯ Diminished on piano, place your right hand with your thumb on F♯, middle finger on A and little finger on C. Press the keys together and listen for an even sound. On the keyboard F♯ is a black key and A and C are white. The thumb starts on a black key, so slide the whole hand a little further in, towards the fallboard. Practice moving in and out of the chord slowly, then bring in a metronome.

  • F♯1
  • A♭3
  • C♭5

F♯ Diminished on guitar

View:
Guitar chord diagram of the F♯ Diminished chord

Switch to the interactive diagram to hear the chord, change voicing and swap finger numbers for note names.

On guitar, F♯ Diminished is commonly played with the voicing shown above. This one is a barre at fret 2: keep the index finger flat across the strings and curve the others so they don't mute the strings next to them. Don't play strings 2 and 1.

F♯ · A · C

Play F♯ Diminished on the online piano

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F♯ Diminished chord notes

Also known as G♭ Diminished

DegreeIntervalSemitonesNoteHear
1Root0F♯(F#)
♭3Minor third3A
♭5Diminished fifth6C

How to use the F♯ Diminished chord

The F♯ Diminished chord is built from a root, a minor third and a diminished fifth. Start at the root F♯ and stack the intervals to get the whole chord: F♯, A and C. The same formula gives you the chord in any other key.

Diminished chords are passing tools in classical, jazz, bluegrass and film music. They're often used as vii° leading to the tonic or as chromatic passing chords between diatonic chords.

In major keys F♯° is the vii° in G major; in minor keys it's the ii° in E minor.

How F♯ Diminished differs from similar chords

F♯° is F♯m with the fifth lowered by a half step, and that flat fifth is the whole difference. Add a minor seventh and you get F♯m7♭5, add a diminished seventh and you get the fully symmetrical F♯°7. On its own it is the leading-tone chord (vii°) of the major key a half step up.

Where F♯ Diminished is used

A diminished chord is a tension chord. It works as the leading-tone chord of a key, and as a dominant seventh with its root left out.

As the leading-tone chordG major
  1. vii°F♯°
  2. IG

Every note pulls inward into G by a semitone or a tone. This is the chord's primary function.

As the ii in a minor ii-V-iE minor
  1. ii°F♯°
  2. V7B7
  3. iEm

The minor cadence. F♯ Diminished leads into the dominant, and the seventh is what makes it a ii rather than a diminished triad.

Scales that contain F♯°

These scales include F♯° as one of their diatonic chords. Use them to find melodies and improvisation ideas that fit perfectly.

Questions people ask

What notes are in the F♯ Diminished chord?
The F♯ Diminished chord contains F♯, A and C (F#, A and C in plain text).
Is the F♯ Diminished chord major or minor?
F♯ Diminished is a diminished chord. Diminished chords sound unstable and suspenseful. Two stacked minor thirds create a tight, dissonant tension that composers use for passing chords, horror scores and dramatic turnarounds.
What key is the F♯ Diminished chord in?
In major keys F♯° is the vii° in G major; in minor keys it's the ii° in E minor.
How do you play F♯ Diminished on piano?
Place your fingers on F♯, A and C and play them together. The root usually goes to the little finger of the left hand, the upper notes to the right. On the keyboard F♯ is a black key and A and C are white. The thumb starts on a black key, so slide the whole hand a little further in, towards the fallboard.
How do you play F♯ Diminished on guitar?
Use the fingering in the diagram above. This one is a barre at fret 2: keep the index finger flat across the strings and curve the others so they don't mute the strings next to them. Don't play strings 2 and 1.
What is another name for the F♯ Diminished chord?
F♯ Diminished is enharmonically equivalent to G♭ Diminished. Both chord names describe exactly the same notes, but the spelling depends on the key you are playing in.