C♯4
Frequency, piano key and harmonics
C♯4 is piano key 41 of 88, MIDI 61, at 277.18 Hz. It sits in the middle of the piano, where most sung melodies sit.
| Harmonic | Frequency | Nearest equal-tempered note |
|---|---|---|
| 1 · fundamental | 277.18 Hz | C♯4 (+0 ¢) |
| 2× | 554.37 Hz | C♯5 (+0 ¢) |
| 3× | 831.55 Hz | G♯5 (+2 ¢) |
| 4× | 1108.73 Hz | C♯6 (+0 ¢) |
| 5× | 1385.91 Hz | F6 (−14 ¢) |
| 6× | 1663.10 Hz | G♯6 (+2 ¢) |
Piano playback uses a recorded piano sample. The sine button is the exact equal-tempered frequency. Neighbors: C4 and D4. Arbitrary pitches and alternate A4 tunings belong on the calculator.
Hear the note. Then name the interval.
Interval and chord drills in the app are built on this same piano and this same tuning.
Download on theApp Store- EQ & compressionDaily drills on drums, bass, guitars and full mixes.
- Intervals & chordsPiano training that uses the same note names as these pages.
- Studio toolsMetronome, tone generator and tap tempo live in the app too.
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FAQ
C♯4 questions
What frequency is C♯4?
277.18 Hz when A4 is 440 Hz. Change the reference on the note calculator if you need another tuning. This page does not change.
What MIDI note is C♯4?
MIDI 61. Piano key 41, counting A0 as key 1 and C8 as key 88.
How loud should I listen?
Keep the tone at a conversation level. These pages can generate steady tones and noise, which fatigue your ears faster than music. If anything rings or feels uncomfortable, stop and turn the volume down.