Musical note
C#4
- C#4
- 277.18 Hz
- MIDI 61
C#4 (enharmonically Db4) is MIDI note 61, sounding at 277.183 Hz in equal temperament with A4 = 440 Hz. Its wavelength in air is 1.2375 m, and it sits in octave 4.
Pitch
Scientific pitch notationC#4
Enharmonic equivalentDb4the same pitch in equal temperament, spelled differently
MIDI note number61
Pitch classC# (1)
Octave4
As a sound wave
Wavelength in air1.2375 mat 343 m/s, dry air at 20 °C
Period3.6077 ms
Frequency one octave down138.591 Hz
AudibleYeshuman hearing runs roughly 20 Hz to 20 kHz and narrows with age
Intervals from here
Octave belowC#3 · 138.59 Hz
Perfect fifth belowF#3 · 185 Hz
Semitone belowC4 · 261.63 Hz
Semitone aboveD4 · 293.66 Hz
Major third aboveF4 · 349.23 Hz
Perfect fifth aboveG#4 · 415.3 Hz
Octave aboveC#5 · 554.37 Hz
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