F♯dim7: F♯/G♭ Diminished 7th Piano Chord

Second inversion: either hand, fingers low note to high
Hand	Notes	Fingers
Right	C, E♭, F♯, A	1-2-3-5
Left	C, E♭, F♯, A	5-4-2-1

Scale degree, note, and interval measured from the root.
Degree	Note	Interval from root	Semitones
1	F♯	Perfect unison	0
♭3	A	Minor third	3
♭5	C	Tritone	6
♭♭7	E♭	Major sixth	9

Construction

F♯ Diminished 7th = Root + Minor 3rd + Diminished 5th + Major 6th = F♯, A, C, E♭

Note	Interval	Degree
F♯	Root	1
A	Minor 3rd	♭3
C	Diminished 5th	♭5
E♭	Major 6th	6

Fingering

Note	Key color	Right hand	Left hand
F♯	black	index finger (2)	little finger (5)
A	white	middle finger (3)	ring finger (4)
C	white	ring finger (4)	middle finger (3)
E♭	black	little finger (5)	index finger (2)

Right hand: index finger (2) on F♯, middle finger (3) on A, ring finger (4) on C, little finger (5) on E♭.

Left hand: little finger (5) on F♯, ring finger (4) on A, middle finger (3) on C, index finger (2) on E♭.

F♯ Diminished 7th Inversions

Root position
F♯ – A – C – E♭
1st inversion (F♯dim7/A)
A – C – E♭ – F♯
2nd inversion (F♯dim7/C)
C – E♭ – F♯ – A
3rd inversion (F♯dim7/E♭)
E♭ – F♯ – A – C

Key Signature

A Diminished 7th chord is built from symmetrical or ambiguous intervals, so it doesn't belong to a single key and has no key signature of its own.

Chords in the Key of F♯ Major

These are the triads built on each degree of F♯ Major:

I — F♯ Major (major)

Degree	Numeral	Chord	Quality
1	I	F♯ Major	Major
2	ii	G♯ Minor	Minor
3	iii	A♯ Minor	Minor
4	IV	B Major	Major
5	V	C♯ Major	Major
6	vi	D♯ Minor	Minor
7	vii°	E♯ Diminished	Diminished

Same Notes, Other Names

The notes F♯ – A – C – E♭ aren’t exclusive to this chord. Depending on which note is the bass and how the chord functions, the same pitches also spell the following:

A Diminished 7th→C Diminished 7th→E♭ Diminished 7th→

F♯ Diminished 7th : Frequently Asked Questions

What is the F♯ Diminished 7th chord on piano?

The F♯ Diminished 7th chord contains the notes F♯ – A – C – E♭. On piano, play these notes together to sound the chord.

What is the F# piano chord?

The F# piano chord (written F♯ Diminished 7th) uses the same keys: F♯ – A – C – E♭. The # and ♯ symbols name the same black key.

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.

F♯ Diminished 7th in detail

Exact

Every pitch class is present and nothing outside the chord is added.

Type	Notes	Semitones	Span	Omissions and additions	Set relation
Close, root position	F♯3 A3 C4 E♭4	9	124 mm	none	identical
Close, first inversion	A3 C4 E♭4 F♯4	9	124 mm	none	identical
Close, second inversion	C4 E♭4 F♯4 A4	9	124 mm	none	identical
Close, third inversion	E♭4 F♯4 A4 C5	9	124 mm	none	identical
Drop 2	C3 F♯3 A3 E♭4	15	206 mm	none	identical
Drop 3	A2 F♯3 C4 E♭4	18	248 mm	none	identical
Drop 2 and 4	F♯2 C3 A3 E♭4	21	289 mm	none	identical

Reduced

A subset of the pitch classes: the identity is incomplete rather than altered.

Type	Notes	Semitones	Span	Omissions and additions	Set relation
Shell, root ♭♭7 ♭3	F♯2 E♭3 A3	15	206 mm	omits C	subset
Guide tones, ♭3 and ♭♭7	A3 E♭4	6	83 mm	omits F♯ and C	subset
Rootless close	A3 C4 E♭4	6	83 mm	omits F♯	subset

Spans are measured centre to centre at a 165 mm octave (standard keyboard geometry).

Position	Bass note	Notes in order	Figured bass	Semitones	Span
Root position	F♯	F♯3, A3, C4, E♭4	7	9	124 mm
First inversion: F♯dim7/A	A	A3, C4, E♭4, F♯4	6/5	9	124 mm
Second inversion: F♯dim7/C	C	C4, E♭4, F♯4, A4	4/3	9	124 mm
Third inversion: F♯dim7/E♭	E♭	E♭4, F♯4, A4, C5	4/2	9	124 mm

One position per chord tone in the bass. Spans are for close position: voiced inversions appear under Voicings.

Change one note

Chords a single note away, and what moving that note does.

Chord	Change	Formula	Common tones
F♯dim	drops E♭	1 ♭3 ♭5	3
F♯m7♭5	E♭ becomes E	1 ♭3 ♭5 ♭7	3
F♯m6	C becomes C♯	1 ♭3 5 6	3
F♯m	C, E♭ becomes C♯	1 ♭3 5	2
F♯m7	C, E♭ becomes C♯, E	1 ♭3 5 ♭7	2
F♯mMaj7	C, E♭ becomes C♯, E♯	1 ♭3 5 7	2
F♯6	A, C becomes A♯, C♯	1 3 5 6	2

Frequencies

Note	MIDI	Frequency
F♯3	54	185.00 Hz
A3	57	220.00 Hz
C4	60	261.63 Hz
E♭4	63	311.13 Hz

Reference pitch A440, 12-TET, close root position.

Set theory: prime form, Forte number, interval vector

Absolute pitch class set: {6, 9, 0, 3}
Normal order: [0, 3, 6, 9]
Prime form: (0369)
Forte number: 4-28
Interval vector: <004002>

Pair	Interval	Semitones	Interval class
F♯ to A	Minor third	3	3
F♯ to C	Tritone	6	6
F♯ to E♭	Major sixth	9	3
A to C	Minor third	3	3
A to E♭	Tritone	6	6
C to E♭	Minor third	3	3

Where these facts come from

Every value on this page is derived from the note formula for a diminished 7th applied to the root F♯, using standard music theory. Nothing here is hand-entered per chord, so the notes, intervals, inversions and frequencies cannot drift out of agreement with each other. Pitches assume 12-TET at A440.

F♯ Diminished 7th

Fingerings

F♯ Diminished 7th: notes and degrees