C♯5 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♯5 | vs 440 |
|---|---|---|
| A4 = 415 Hz · Baroque pitch | 522.87 Hz | −101.3¢ |
| A4 = 432 Hz · “Verdi” pitch | 544.29 Hz | −31.8¢ |
| A4 = 440 Hz · Standard (ISO 16) | 554.37 Hz | — |
| A4 = 442 Hz · Orchestral | 556.89 Hz | +7.9¢ |
One cycle of C♯5 lasts 1.804 ms, and its wavelength in air at 20 °C is 61.9 cm. Hold it as a steady tone in the tone generator.
C♯5 on the piano
C♯5 is key 53 of 88, counting from the bottom — the black key between C and D. Press any key below to compare it with its neighbours.
C♯5 on the guitar
In standard tuning C♯5 is played in 3 places: 3rd (G) string, fret 18, 2nd (B) string, fret 14 and 1st (high E) string, fret 9. The same pitch in each place, with a different tone: lower strings sound warmer. Guitar music is written an octave higher than it sounds, so on a guitar part this note is printed as C♯6.
C♯5 on the staff
Instruments that can play C♯5
44 instruments play C♯5 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
Brass
Tuned percussion
Only at the extreme of their range
Voices: C♯5 is inside the typical range of the alto, mezzo-soprano and soprano. Test your own range.
The harmonics of C♯5
A played C♯5 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) | 554.37 Hz | C♯5 | 0¢ |
| 2 | 1108.7 Hz | C♯6 | 0¢ |
| 3 | 1663.1 Hz | A♭6 | +2.0¢ |
| 4 | 2217.5 Hz | C♯7 | 0¢ |
| 5 | 2771.8 Hz | F7 | −13.7¢ |
| 6 | 3326.2 Hz | A♭7 | +2.0¢ |
| 7 | 3880.6 Hz | B7 | −31.2¢ |
| 8 | 4434.9 Hz | C♯8 | 0¢ |
Frequently asked questions
What is the frequency of C♯5?
C♯5 is 554.37 Hz in equal temperament with A4 tuned to 440 Hz, the international standard. At A4 = 432 Hz it is 544.29 Hz, and at the orchestral A4 = 442 Hz it is 556.89 Hz.
Is C♯5 the same note as D♭5?
On a piano, a guitar or a tuner, yes: C♯5 and D♭5 are the same key and the same frequency, 554.37 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♯5 on a piano?
C♯5 is key 53 of 88, counting from the bottom — the black key between C and D.
Which instruments can play C♯5?
44 of the instruments we chart play C♯5 within their normal range, including violin, viola, cello, erhu, guitar, and 4 more reach it only at the extreme of their range.
Typing it? C♯5 is also written C#5 or Db5. Convert any frequency on the Hz-to-note converter.