C# major has seven sharps — F#, C#, G#, D#, A#, E#, and B# — and sits seven clockwise steps from C on the circle of fifths. It's the enharmonic equivalent of D♭ major (five flats), and almost all practical music in this pitch is written in D♭ instead because the signature is much cleaner.
Key signature
- 1.F#
- 2.C#
- 3.G#
- 4.D#
- 5.A#
- 6.E#
- 7.B#
Added in the standard order of sharps.
Diatonic chords
The seven triads built on each scale degree. These are the chords you hear used most in C# major:
| Roman | Chord | Quality | Notes |
|---|---|---|---|
| I | C# | major | C# · E# · G# |
| ii | D#m | minor | D# · F# · A# |
| iii | E#m | minor | E# · G# · B# |
| IV | F# | major | F# · A# · C# |
| V | G# | major | G# · B# · D# |
| vi | A#m | minor | A# · C# · E# |
| vii° | B#° | diminished | B# · D# · F# |
Common progressions
C# major exists primarily as a theoretical key. Bach wrote a Prelude and Fugue in C# major in The Well-Tempered Clavier specifically to demonstrate that all twelve keys could be playable in equal temperament. In day-to-day music, you'll see D♭ written instead almost every time.
Relative minor
The relative minor of C# major is A# minor — it shares the same key signature, just centred on the 6th degree of the C# major scale (A#). A piece can move between C# major and A# minor freely without any change of accidentals.
Common mistakes
Every letter of the C# scale is sharpened — including E# (= F natural) and B# (= C natural). Beginners often miswrite these as F and C, which would create double-letter spellings. If you find yourself writing in C# major, double-check whether the surrounding music would read more cleanly in D♭ — usually it would.
Drill it
The Circle of Fifths trainer drills every key signature — C# major included — with timed flash cards and best-time tracking.
Open the Circle of Fifths Trainer →Or try today's Etudle puzzleFrequently asked
- How many sharps does C# major have?
- C# major has seven sharps: F#, C#, G#, D#, A#, E#, and B#.
- What are the notes in the C# major scale?
- C#, D#, E#, F#, G#, A#, B#.
- What is the relative minor of C# major?
- A# minor — same seven-sharp key signature.
- Is C# major the same as D♭ major?
- They sound identical (enharmonic equivalents) but are spelled differently. D♭ major (five flats) is far more common in printed music than C# major (seven sharps).