F# Diminished 7th

Notes:F# – A – C – D#

Formula:R-m3-d5-d7

Intervals:P1-m3-d5-d7

Scale Degrees:1-b3-b5-bb7

Introduction

The F# Diminished 7th piano chord (F#dim7) consists of the notes F#, A, C, D#. It is built by stacking three minor thirds, creating a fully symmetrical 4-note chord, giving it a extremely tense and dramatic character, fully symmetrical and harmonically versatile. Formula: R-m3-d5-d7 | Scale degrees: 1-b3-b5-bb7.

Enharmonic equivalent: F♯ is enharmonically equivalent to G♭. See Gb Diminished 7th.

Notes

Notes:F# – A – C – D#

F# Diminished 7th Inversions

Position	Notes
Root Position	F#4 – A4 – C5 – D#5
1st Inversion	A4 – C5 – D#5 – F#5
2nd Inversion	C5 – D#5 – F#5 – A5
3rd Inversion	F#4 – A4 – C5 – D#4

Key Signature

The key of F# Diminished 7th has 6 sharps: F♯, C♯, G♯, D♯, A♯, E♯.

F♯C♯G♯D♯A♯E♯

Theory: Intervals

Formula: R-m3-d5-d7

Intervals: P1-m3-d5-d7

The F# Diminished 7th is built by stacking intervals from the root note. The formula R-m3-d5-d7 describes the scale degrees used. The intervals P1-m3-d5-d7 show the distance between each note in the chord.

F# Diminished 7th — Frequently Asked Questions

What notes are in the F# Diminished 7th chord?

F# Diminished 7th is built from the F# root. Check the interactive keyboard above for exact notes and fingering.

How is the F# Diminished 7th chord used in music?

F# Diminished 7th appears in jazz, pop, and classical contexts. Its sound depends on the chord quality (Diminished 7th).

What is the fingering for F# Diminished 7th?

See the fingering chart above. Right hand typically uses thumb on root. Left hand uses pinky on root.

What are the inversions of F# Diminished 7th?

Use the inversion buttons above to see each inversion with notes, fingering, and staff notation.

Practice Tips

Symmetrical — only 3 unique dim7 chords.
Pivot chord for modulation.
Maximum dramatic tension.
Classical cadence chord.
Compare with F#m7b5.
Film scoring suspense.