Musical note
B4
- B4
- 493.88 Hz
- MIDI 71
B4 is MIDI note 71, sounding at 493.883 Hz in equal temperament with A4 = 440 Hz. Its wavelength in air is 0.6945 m, and it sits in octave 4.
Pitch
Scientific pitch notationB4
MIDI note number71
Pitch classB (11)
Octave4
As a sound wave
Wavelength in air0.6945 mat 343 m/s, dry air at 20 °C
Period2.0248 ms
Frequency one octave down246.942 Hz
AudibleYeshuman hearing runs roughly 20 Hz to 20 kHz and narrows with age
Intervals from here
Octave belowB3 · 246.94 Hz
Perfect fifth belowE4 · 329.63 Hz
Semitone belowA#4 · 466.16 Hz
Semitone aboveC5 · 523.25 Hz
Major third aboveD#5 · 622.25 Hz
Perfect fifth aboveF#5 · 739.99 Hz
Octave aboveB5 · 987.77 Hz
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