C♯6 at every common reference pitch
A note’s frequency depends on what A4 is tuned to. The standard is 440 Hz; the other three are the ones you are most likely to meet. The cents column is how far each one sits from the 440 version — the same for every note, because changing the reference moves the whole scale together.
| Reference | C♯6 | vs 440 |
|---|---|---|
| A4 = 415 Hz · Baroque pitch | 1045.7 Hz | −101.3¢ |
| A4 = 432 Hz · “Verdi” pitch | 1088.6 Hz | −31.8¢ |
| A4 = 440 Hz · Standard (ISO 16) | 1108.7 Hz | — |
| A4 = 442 Hz · Orchestral | 1113.8 Hz | +7.9¢ |
One cycle of C♯6 lasts 901.9 µs, and its wavelength in air at 20 °C is 30.9 cm. Hold it as a steady tone in the tone generator.
C♯6 on the piano
C♯6 is key 65 of 88, counting from the bottom — the black key between C and D. Press any key below to compare it with its neighbours.
C♯6 on the guitar
C♯6 is above the 19th fret, the top of a classical guitar; on an electric with more frets it is the 1st string at fret 21.
C♯6 on the staff
Instruments that can play C♯6
29 instruments play C♯6 within the normal range, and 4 reach it only at the extreme of theirs. Each links to its range chart; for a transposing instrument, the note on its part is shown.
Guitars and basses
Plucked and struck strings
Woodwind
Only at the extreme of their range
C♯6 is outside the typical range of all six voice types. Test your own range.
The harmonics of C♯6
A played C♯6 is not one frequency. A string or a pipe also sounds whole-number multiples of it, and the mix of those harmonics is the instrument’s tone. Here is where the first eight land — and why the 7th sounds out of tune against a piano.
| Harmonic | Frequency | Nearest note | Off by |
|---|---|---|---|
| 1 (fundamental) | 1108.7 Hz | C♯6 | 0¢ |
| 2 | 2217.5 Hz | C♯7 | 0¢ |
| 3 | 3326.2 Hz | A♭7 | +2.0¢ |
| 4 | 4434.9 Hz | C♯8 | 0¢ |
| 5 | 5543.7 Hz | F8 | −13.7¢ |
| 6 | 6652.4 Hz | A♭8 | +2.0¢ |
| 7 | 7761.1 Hz | B8 | −31.2¢ |
| 8 | 8869.8 Hz | C♯9 | 0¢ |
Frequently asked questions
What is the frequency of C♯6?
C♯6 is 1108.7 Hz in equal temperament with A4 tuned to 440 Hz, the international standard. At A4 = 432 Hz it is 1088.6 Hz, and at the orchestral A4 = 442 Hz it is 1113.8 Hz.
Is C♯6 the same note as D♭6?
On a piano, a guitar or a tuner, yes: C♯6 and D♭6 are the same key and the same frequency, 1108.7 Hz, in equal temperament. They are two names for one pitch (enharmonic equivalents). Which one is written depends on the key — sharps in sharp keys, flats in flat keys — and a string or wind player may pitch them a few cents apart when playing in just intonation.
How do I play C♯6 on a piano?
C♯6 is key 65 of 88, counting from the bottom — the black key between C and D.
Which instruments can play C♯6?
29 of the instruments we chart play C♯6 within their normal range, including violin, viola, cello, erhu, 7-string guitar, and 4 more reach it only at the extreme of their range.
Typing it? C♯6 is also written C#6 or Db6. Convert any frequency on the Hz-to-note converter.