B0
30.868Hz at concert pitch
Press to hear a pure sine tone at this pitch.
MIDI note
23
Piano key
3
Octave
0
Frequency
30.868 Hz
Period
32.396 ms
Wavelength
11.1118 m
Pitch class
B
Notation
SPN
MIDI is the note number synths and software pass around (0–127). Pitch class is the note without its octave — all the Bs share one.
At other reference pitches
| Reference (A4) | B0 frequency | Where you meet it |
|---|---|---|
| 432 Hz | 30.306 Hz | the alternative-tuning circle |
| 440 Hzstandard | 30.868 Hz | the ISO 16 standard — concert pitch |
| 442 Hz | 31.008 Hz | many European orchestras tune a touch sharp |
| 443 Hz | 31.078 Hz | some sharper continental orchestras |
Every row is B0 — only the A4 you tune to changes. A frequency scales straight with the reference: B0 at 432 Hz is the 440 Hz value times 432⁄440.
Move around
Every B
Chords with B in them
B appears in each of these — see the whole chord grid.