Explore C#7(#5) Guitar Chord: Interactive Fretboard Shapes
The C# augmented seventh chord, written C#7#5, is spelled C#, E#, G## and B: the root, major third, raised fifth and minor seventh. A scale that covers every chord tone is the C# whole-tone scale, which is where to start when you improvise.
Compared with a plain dominant seventh, only the fifth changes: it is raised by a semitone. The listed voicings run from fret 2 up to fret 10. Spelling it correctly takes E# and G##, which is why the same sound is also written Db7#5.
It belongs to the dominant family, which our guide to dominant chords covers. Turn on the note labels in the interactive fretboard at the top to read the name of every note under your fingers.
C# dominant 7th with sharp 5th guitar chord is also written as C#7(#5), C#7#5, C#7+5 or C#aug7.
Notes of the C# 7(#5) chord:
Formula of the Dominant Seventh Sharp Fifth chord:
Formula: 1 3 #5 b7
C# 7(#5) Chord Interactive Fretboard
Want a structured chord roadmap instead of jumping between pages?
Go to the full guitar chords tutorial.
C# 7(#5) Guitar Chord Diagrams
Position 1 Barre Movable
Finger Positions
- Mute the low E string
- Mute the high E string
- Place your index finger (1) on the fret 2 of the A, G and B strings at the same time
- Place your middle finger (2) on the fret 3 of the D string
Position 2 Barre Movable
Finger Positions
- Mute the low E string
- Place your index finger (1) on the fret 4 of the A and G strings at the same time
- Place your middle finger (2) on the fret 5 of the high E string
- Place your ring finger (3) on the fret 6 of the B string
- Place your pinky finger (4) on the fret 7 of the D string
Position 3 Barre Movable
Finger Positions
- Mute the A string
- Place your index finger (1) on the fret 9 of the low E, D and high E strings at the same time
- Place your middle finger (2) on the fret 10 of the G string
- Place your ring finger (3) on the fret 10 of the B string
Find more shapes in our all guitar chords online library. If you
prefer a printable pdf, download
the Free Guitar Chords Chart Pdf
Created by
Giancarlo is a musician (teaching guitar since 2000), software engineer, AI consultant and published researcher
FAQ
Which notes make up C#7#5?
C#7#5 contains C#, E#, G## and B. These are the root, a major third, a raised fifth and a minor seventh. E# sounds like F and G## like A.
How does C#7#5 differ from C# augmented?
The C# augmented triad is C#, E# and G##. C#7#5 adds B on top, a minor seventh, ten semitones from the root. That addition gives the chord a dominant sound.
What changes between C# dominant seventh and C#7#5?
The fifth is raised. C#7 has G#, while C#7#5 has G##, a semitone higher. The major third E# and minor seventh B are the same.
Which scale fits C# augmented seventh?
The C# whole-tone scale, C#, D#, E#, F##, G##, B, contains all four chord tones, so it is a dependable scale for lines over C#7#5.
How many C#7#5 voicings can be played?
There are 3 voicings, all of them using a barre. None has an open string. They run from fret 2 to fret 10.
