The C♯ Note
C♯ is a black key, immediately next to C. It sounds at 277.18 Hz in octave 4.
C♯ on the piano
Key facts
- On the keyboard
- a black key, immediately next to C.
- Frequency (octave 4)
- 277.18 Hz
- MIDI number (octave 4)
- 61
- Also written as
- D♭
- In key signatures
- The 2 sharp in the order of sharps.
C♯ and its enharmonic spellings
C♯ can also be written as D♭. These are enharmonic equivalents: the same pitch, the same key on the piano, a different name on the page. Which spelling is correct depends on the key and on how the note functions, not on the sound.
C♯ frequency in every octave
Frequencies for C♯ in scientific pitch notation, with A4 tuned to 440 Hz.
| Note | MIDI | Frequency |
|---|---|---|
| C♯1 | 25 | 34.65 Hz |
| C♯2 | 37 | 69.3 Hz |
| C♯3 | 49 | 138.59 Hz |
| C♯4 | 61 | 277.18 Hz |
| C♯5 | 73 | 554.37 Hz |
| C♯6 | 85 | 1108.73 Hz |
| C♯7 | 97 | 2217.46 Hz |
Chords on C♯
The most common chords built with C♯ as the root.
Scales starting on C♯
Keys and scales that use C♯ as their tonic.
All notes
الأسئلة الشائعة
Where is C♯ on the piano?
C♯ is a black key, immediately next to C.
What frequency is C♯4?
C♯4 sounds at 277.18 Hz with A4 tuned to 440 Hz.
What is another name for C♯?
C♯ can also be written as D♭. They are the same pitch spelled differently.
