C♯ Augmented 7th
Also Known As
Hear the C♯ Augmented 7th chord played for you.
C♯+7
C♯ – F – A – B
Formula:R-M3-A5-m7
Intervals:P1-M3-A5-m7
Scale Degrees:1-3-#5-b7
Introduction
The C♯ Augmented 7th chord is a four-note chord made up of C♯, F, A, and B. It is built from a root, major third, augmented fifth, and minor seventh.
The C# Augmented 7th piano chord (C#+7) consists of the notes C#, F, A, B. It is an augmented triad with an added minor 7th, giving it a bright, tense, and unresolved character with a strong upward pull. Formula: R-M3-A5-m7 | Scale degrees: 1-3-#5-b7.
Notes
C♯ Augmented 7th Inversions
| Position | Notes |
|---|---|
| Root Position | C# – F – A – B |
| 1st Inversion | F – A – B – C# |
| 2nd Inversion | A – B – C# – F |
| 3rd Inversion | C# – F – A – B |
Key Signature
The key of C# Augmented 7th has 7 sharps.
F♯C♯G♯D♯A♯E♯B♯
Order of sharps
Sharps are added to a key signature in a fixed order. Each new sharp key adds the next sharp on the list.
F♯C♯G♯D♯A♯E♯B♯
Mnemonic: Father Charles Goes Down And Ends Battle
Chords in the Key of C# Major
These are the diatonic triads built on each degree of the C# major scale:
C
D
E
F
G
A
B
C
D
E
F
G
A
B
I — C♯ Major (major)
Theory: Intervals
Formula: R-M3-A5-m7
Intervals: P1-M3-A5-m7
The C♯ Augmented 7th is built by stacking intervals from the root note. The formula R-M3-A5-m7 describes the scale degrees used. The intervals P1-M3-A5-m7 show the distance between each note in the chord.
C♯ Augmented 7th — Frequently Asked Questions
What notes are in the C# Augmented 7th chord?
C# Augmented 7th is built from the C# root. Check the interactive keyboard above for exact notes and fingering.
How is the C# Augmented 7th chord used in music?
C# Augmented 7th appears in jazz, pop, and classical contexts. Its sound depends on the chord quality (Augmented 7th).
What is the fingering for C# Augmented 7th?
See the fingering chart above. Right hand typically uses thumb on root. Left hand uses pinky on root.
What are the inversions of C# Augmented 7th?
Use the inversion buttons above to see each inversion with notes, fingering, and staff notation.
Practice Tips
- Dominant with raised fifth.
- Resolves to the tonic.
- Whole-tone scale colour.
- Jazz altered dominant.
- Compare with C#7 and C#aug.
- Creates forward motion.
Related Tools
Chord FinderLook up any chord — see the notes, hear it, and play along.Chord DrillTimed drills to build speed and recognition across all chord types.Practice RoomPlug in a MIDI keyboard and get real-time feedback on every chord and scale.Circle of FifthsVisualize key relationships, relative minors, and key signatures.MIDI MonitorLive MIDI message stream with note names, velocity, and a scrolling staff.