Learn F dim7 Chord: Theory & Interactive Guitar Practice
What is in Fdim7, the F diminished seventh chord? The notes are F, Ab, Cb and Ebb.
All 5 voicings are fretted without a barre, and none uses an open string. In sound, Fdim7 is the vii chord of F# harmonic minor, even though that key spells it with different letters. Its sound is tense and symmetrical, and it tends to resolve toward a more stable chord. Notes such as Cb and Ebb are written that way to keep one letter name per chord tone, even though they sound like simpler notes.
Every note of Fdim7 sits inside the F whole-half scale, so that scale is the natural place to look for melody notes. In the chord player at the top, each shape comes with its note names labelled on the fretboard.
F diminished 7th guitar chord is also written as Fdim7, F°7 or Fo7. It is also known as the F fully diminished seventh chord.
Notes in the F dim7 chord:
Chord structure of the Diminished Seventh chord:
Formula: 1 b3 b5 bb7
F Dim7 Chord Interactive Fretboard
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F Dim7 Guitar Chord Diagrams
Position 1 Movable
Finger Positions
- Mute the B string
- Mute the high E string
- Place your index finger (1) on the fret 3 of the D string
- Place your middle finger (2) on the fret 4 of the low E string
- Place your ring finger (3) on the fret 4 of the G string
- Place your pinky finger (4) on the fret 5 of the A string
Position 2 Movable
Finger Positions
- Mute the low E string
- Mute the high E string
- Place your index finger (1) on the fret 10 of the G string
- Place your middle finger (2) on the fret 11 of the A string
- Place your ring finger (3) on the fret 12 of the D string
- Place your pinky finger (4) on the fret 12 of the B string
Position 3 Movable
Finger Positions
- Mute the low E string
- Mute the A string
- Place your index finger (1) on the fret 12 of the D string
- Place your middle finger (2) on the fret 12 of the B string
- Place your ring finger (3) on the fret 13 of the G string
- Place your pinky finger (4) on the fret 13 of the high E string
Position 4 Movable
Finger Positions
- Mute the low E string
- Mute the high E string
- Place your index finger (1) on the fret 7 of the G string
- Place your middle finger (2) on the fret 8 of the A string
- Place your ring finger (3) on the fret 9 of the D string
- Place your pinky finger (4) on the fret 9 of the B string
Position 5 Movable
Finger Positions
- Mute the low E string
- Mute the A string
- Place your index finger (1) on the fret 3 of the D string
- Place your middle finger (2) on the fret 3 of the B string
- Place your ring finger (3) on the fret 4 of the G string
- Place your pinky finger (4) on the fret 4 of the high E string
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Created by
Giancarlo is a musician (teaching guitar since 2000), software engineer, AI consultant and published researcher
FAQ
What notes form Fdim7?
Fdim7 is spelled F, Ab, Cb and Ebb. These are the root, minor third, flat fifth and diminished seventh, and they sound like F, G#, B and D.
Why does Fdim7 contain Ebb?
The seventh of F falls on the letter E. A minor seventh would be Eb, and a diminished seventh is one semitone lower, Ebb, which sounds like D.
Does Fdim7 sound like Abdim7?
Yes, Fdim7 has the same pitches as Abdim7, Bdim7 and Ddim7. All are stacks of minor thirds, so the chords are interchangeable in sound.
Which scale matches Fdim7?
The F whole-half scale, spelled F, G, Ab, Bb, Cb, Db, D, E, contains every note of the chord. It makes a convenient pool for melodies.
Where is Fdim7 the vii chord?
Fdim7 has the same pitches as the vii chord of F# harmonic minor, built on the raised seventh degree. It leans toward F# minor.
How many Fdim7 voicings are there on guitar?
There are 5 voicings, none using an open string or a barre. The lowest is at fret 3 and the highest at fret 13.
